Why the template column having multiline textbox in gridview CSS issues with IE 11 & IIS 8?

.NeST_GRIDMTEXTBOX
{
    FONT-WEIGHT: normal;
    FONT-SIZE: 8pt;
    COLOR: #6B5973;
    FONT-FAMILY: "Lucida Sans Unicode", "Lucida Grande", Sans-Serif;
    HEIGHT:44px;
    width:178px;
    background-color: Transparent;
    border-style:none;
    position:static;
    overflow:auto;
    
}

<cc1:XDataGrid ID="grdCustEnq" runat="server" AllowPaging="True" AllowCustomPaging="true"
Width="220%" AutoGenerateColumns="False" CssClass="NeST_DATAGRID_FIXED_SIZE" ShowFooter="True"
>
<alternatingitemstyle borderwidth="0px" cssclass="NeST_DATAGRID_CELLDATA2">
<itemstyle borderwidth="0px" cssclass="NeST_DATAGRID_CELLDATA" horizontalalign="Left">

<HeaderStyle CssClass="NeST_DATAGRID_HEADING"></HeaderStyle>
<pagerstyle horizontalalign="Left" mode="NumericPages" wrap="True" cssclass="NeST_DATAGRID_CELLDATANEW">
<columns> <asp:TemplateColumn HeaderText="Sl No.">
<itemtemplate>
<asp:Label runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.SlNo") %>'
ID="SlNo"/>

<asp:ImageButton ID="imgPDF" ToolTip="Click to View Report" CommandName="View" Width="30px" ImageUrl="~/Images/PDF.jpg" runat="server" />


<HeaderStyle Width="3%"/>
<itemstyle horizontalalign="Center">

<asp:TemplateColumn HeaderText="File Type" SortExpression="MessageType">
<itemtemplate>
<asp:TextBox ID="txtFileType" runat="server" Style="position: static" CssClass="NeST_GRIDMTEXTBOX"
Width="133%" ReadOnly="true" TextMode="MultiLine" Text='<%# DataBinder.Eval(Container, "DataItem.MessageType") %>' >
<input type="hidden" runat="server" id="HidFileId" name="hidId_O" value='<%# DataBinder.Eval(Container, "DataItem.FileId") %>' />

<HeaderStyle Width="3%"/>

<asp:TemplateColumn HeaderText="Value Date">
<itemtemplate>
<asp:TextBox ID="txtValueDate" runat="server" Style="position: static" CssClass="NeST_GRIDMTEXTBOX"
Width="125%" ReadOnly="true" TextMode="MultiLine" Text='<%# DataBinder.Eval(Container, "DataItem.ValueDate", "{0:dd-MMM-yyyy}") %>' >

<HeaderStyle Width="4%"/>
<itemstyle horizontalalign="Center">

<asp:TemplateColumn HeaderText="Created Date & Time">
<itemtemplate>
<asp:TextBox ID="txtDate" runat="server" Style="position: static" CssClass="NeST_GRIDMTEXTBOX"
Width="114%" ReadOnly="true" TextMode="MultiLine" Text='<%# DataBinder.Eval(Container, "DataItem.CreatedDate", "{0:dd-MMM-yyyy HH:mm}") %>' >

<HeaderStyle Width="5%"/>
<itemstyle horizontalalign="Center">

<asp:TemplateColumn HeaderText="Amount">
<itemtemplate>
<asp:TextBox ID="txtAmount" runat="server" Style="position: static" CssClass="NeST_GRIDMTEXTBOX"
Width="115%" ReadOnly="true" TextMode="MultiLine" Text='<%# Eval("Amount","{0:###,####,###.00}") %>' >

<HeaderStyle Width="6%"/>


<asp:TemplateColumn HeaderText="Sending Inst. Ref.">
<itemtemplate>
<asp:TextBox ID="txtInstReferee" runat="server" Style="position: static" CssClass="NeST_GRIDMTEXTBOX"
Width="119%" ReadOnly="true" TextMode="MultiLine" Text='<%# DataBinder.Eval(Container, "DataItem.SendingInstitutionRef") %>' >

<HeaderStyle Width="4%"/>

<asp:TemplateColumn HeaderText="Rel. Ref.">
<itemtemplate>
<asp:TextBox ID="txtRelRef" runat="server" Style="position: static" CssClass="NeST_GRIDMTEXTBOX"
Width="119%" ReadOnly="true" TextMode="MultiLine" Text='<%# DataBinder.Eval(Container, "DataItem.RelRef") %>' >

<HeaderStyle Width="4%"/>

<asp:TemplateColumn HeaderText="UAEFTS ID">
<itemtemplate>
<asp:TextBox ID="txtUaeFtsID" runat="server" Style="position: static" CssClass="NeST_GRIDMTEXTBOX"
Width="119%" ReadOnly="true" TextMode="MultiLine" Text='<%# DataBinder.Eval(Container, "DataItem.UaeftsID") %>' >

<HeaderStyle Width="4%"/>

<asp:TemplateColumn HeaderText="FTS File Name">
<itemtemplate>
<asp:TextBox ID="txtFileName" runat="server" Style="position: static" CssClass="NeST_GRIDMTEXTBOX"
Width="119%" ReadOnly="true" TextMode="MultiLine" Text='<%# DataBinder.Eval(Container, "DataItem.FTSFileName") %>' >

<HeaderStyle Width="5%"/>

<asp:TemplateColumn HeaderText="Status">
<itemtemplate>
<asp:TextBox ID="txtStatus" runat="server" Style="position: static" CssClass="NeST_GRIDMTEXTBOX"
Width="115%" ReadOnly="true" TextMode="MultiLine" Text='<%# DataBinder.Eval(Container, "DataItem.FStatus") %>' >

<HeaderStyle Width="7%"/>

<asp:TemplateColumn HeaderText="A/C with Institution">
<itemtemplate>
<asp:TextBox ID="txtBeneficiaryAcNo" runat="server" Style="position: static" CssClass="NeST_GRIDMTEXTBOX"
Width="124%" ReadOnly="true" TextMode="MultiLine" Text='<%# DataBinder.Eval(Container, "DataItem.AccountInstitution") %>' >

<HeaderStyle Width="6%"/>

<asp:TemplateColumn HeaderText="Beneficiary A/C No./Beneficiary A/C Name.">
<itemtemplate>
<asp:TextBox ID="txtBeneficiaryAcName" runat="server" Style="position: static" CssClass="NeST_GRIDMTEXTBOX"
Width="108%" ReadOnly="true" TextMode="MultiLine" Text='<%# DataBinder.Eval(Container, "DataItem.BeneficiaryAcName") %>' >

<HeaderStyle Width="9%"/>

<asp:TemplateColumn HeaderText="Beneficiary Bank\Ordering Bank">
<itemtemplate>
<asp:TextBox ID="txtBeneficiaryBank" runat="server" Style="position: static" CssClass="NeST_GRIDMTEXTBOX"
Width="110%" ReadOnly="true" TextMode="MultiLine" Text='<%# DataBinder.Eval(Container, "DataItem.BeneficiaryBank") %>' >

<HeaderStyle Width="7%"/>


<asp:TemplateColumn HeaderText="Order A/C No.">
<itemtemplate>
<asp:TextBox ID="txtOrderAcNo" runat="server" Style="position: static" CssClass="NeST_GRIDMTEXTBOX"
Width="110%" ReadOnly="true" TextMode="MultiLine" Text='<%# DataBinder.Eval(Container, "DataItem.OrderAcNo") %>' >

<HeaderStyle Width="8%"/>


<asp:TemplateColumn HeaderText="Order A/C Name">
<itemtemplate>
<asp:TextBox ID="txtOrderAcName" runat="server" Style="position: static" CssClass="NeST_GRIDMTEXTBOX"
Width="120%" ReadOnly="true" TextMode="MultiLine" Text='<%# DataBinder.Eval(Container, "DataItem.OrderAcName") %>' >

<HeaderStyle Width="4%"/>


<asp:TemplateColumn HeaderText="Transaction Type">
<itemtemplate>
<asp:TextBox ID="txtTransactionType" runat="server" Style="position: static" CssClass="NeST_GRIDMTEXTBOX"
Width="120%" ReadOnly="true" TextMode="MultiLine" Text='<%# DataBinder.Eval(Container, "DataItem.TransactionType") %>' >

<HeaderStyle Width="4%"/>


<asp:TemplateColumn HeaderText="SrcSys">
<itemtemplate>
<asp:TextBox ID="txtSrcSystem" runat="server" Style="position: static" CssClass="NeST_GRIDMTEXTBOX"
Width="140%" ReadOnly="true" TextMode="MultiLine" Text='<%# DataBinder.Eval(Container, "DataItem.FileFormatType") %>' >

<HeaderStyle Width="2%"/>


<asp:TemplateColumn HeaderText="SrcDept">
<itemtemplate>
<asp:TextBox ID="txtSrcDept" runat="server" Style="position: static" CssClass="NeST_GRIDMTEXTBOX"
Width="130%" ReadOnly="true" TextMode="MultiLine" Text='<%# DataBinder.Eval(Container, "DataItem.DeptCode") %>' >

<HeaderStyle Width="3%"/>


<asp:TemplateColumn HeaderText="Bank Maker">
<itemtemplate>
<asp:TextBox ID="txtSrcMaker" runat="server" Style="position: static" CssClass="NeST_GRIDMTEXTBOX"
Width="120%" ReadOnly="true" TextMode="MultiLine" Text='<%# DataBinder.Eval(Container, "DataItem.BankMaker") %>' >

<HeaderStyle Width="4%"/>


<asp:TemplateColumn HeaderText="Bank Checker">
<itemtemplate>
<asp:TextBox ID="txtSrcChecker" runat="server" Style="position: static" CssClass="NeST_GRIDMTEXTBOX"
Width="120%" ReadOnly="true" TextMode="MultiLine" Text='<%# DataBinder.Eval(Container, "DataItem.BankChecker") %>' >

<HeaderStyle Width="4%"/>

<asp:TemplateColumn HeaderText="Charge Code">
<itemtemplate>
<asp:TextBox ID="txtChargeCode" runat="server" Style="position: static" CssClass="NeST_GRIDMTEXTBOX"
Width="135%" ReadOnly="true" TextMode="MultiLine" Text='<%# DataBinder.Eval(Container, "DataItem.ChargeCode") %>' >

<HeaderStyle Width="2%"/>