Weird "hidden" fields in the Web PAge

Dear Everyone,
 
I have this small problem which you could help me with. Upon deploying the compiled files to a our test server, everything seems fine but somehow, there was this clickable "hidden" field on the page that our QA encountered.
Thanks for any ideas as I've already tried google and banging my head on my desk but to no avail.
 
Cheers.
Reima Cram
 
Sample Screenshot
http://i1247.photobucket.com/albums/gg635/reimacram/WeirdHiddenField.jpg[^]
 
Code
 

<div id="Loading">
    <img alt="" src="images/progress.gif" /><span style="font:Verdana 12px; color:Red">Please wait while loading...</span>
    </div>
 
    <table id="tblSearchHeader" border="0" cellpadding="0" cellspacing="0" width="100%">
       <tr>
        <td style="background: lightgrey; height: 20px; text-align: left">
            <span style="font-size: 8pt; color:saddlebrown; font-family: Verdana"><strong>Remedy Transaction - Search Criteria</strong></span></td>
    </tr>
    <tr>
        <td style="height: 10px; text-align: left;"></td>
    </tr>
</table>
 
<table id="tblSearch" border="0" cellpadding="0" cellspacing="0" width="620px">
    <tr>
        <td class="FontText" style="height: 15px; width: 150px">
            Process Status
        </td>
        <td class="FontText" style="height: 15px; width: 470px">
            <select id="ddlProcessStatus" style="font-family:Verdana; font-size:8pt;">
                <option value="0">
                    Select...
                </option>
                <option value="U">
                    U - Unprocessed
                </option>
                <option value="R">
                  R - Remedied not yet confirmed
                </option>
                <option value="C">
                  C - Confirmed not yet transferred
                </option>
           </select>
        </td>
    </tr>
    <tr>
        <td class="FontText" style="height: 15px;">
            Store ID
        </td>
        <td class="FontText" style="height: 15px;">
            <input id="txtStoreID" type="text" style="font-family:Verdana; font-size:8pt; width:130px" maxlength="4"/>
        </td>
    </tr>
    <tr>
        <td class="FontText" style="height: 15px;">
            Machine ID
        </td>
        <td class="FontText" style="height: 15px;">
            <input id="txtMachineID" type="text" style="font-family:Verdana; font-size:8pt; width:130px" maxlength="3" />
        </td>
    </tr>
    <tr>
        <td class="FontText" style="height: 15px;">
            Transaction Date From
        </td>
        <td class="FontText" style="height: 15px;">
            <input id="txtDateFrom" type="text" style="font-family:Verdana; font-size:8pt; width:130px" maxlength="10" />
            (DD-MM-YYYY)
        </td>
    </tr>
    <tr>
        <td class="FontText" style="height: 15px;">
            Transaction Date To
        </td>
        <td class="FontText" style="height: 15px;">
            <input id="txtDateTo" type="text" style="font-family:Verdana; font-size:8pt; width:130px" maxlength="10"/>
            (DD-MM-YYYY)
        </td>
    </tr>
    <tr>
        <td class="FontText" style="height: 15px;">
            Merchant Code
        </td>
        <td class="FontText" style="height: 15px;">
            <input id="txtMerchantCode" type="text" style="font-family:Verdana; font-size:8pt; width:130px" maxlength="3"/>
        </td>
    </tr>
    <tr>
        <td class="FontText" style="height: 15px;">
            Account No.
        </td>
        <td class="FontText" style="height: 15px;">
            <input id="txtAccountNo" type="text" style="font-family:Verdana; font-size:8pt; width:130px" maxlength="50" />
        </td>
    </tr>
    <tr>
        <td class="FontText" style="height: 15px;">
            Sequence No.
        </td>
        <td class="FontText" style="height: 15px;">
            <input id="txtSequenceNo" type="text" style="font-family:Verdana; font-size:8pt; width:130px" maxlength="4" />
        </td>
    </tr>
     <tr>
        <td colspan="2" align="left">
            <input id="btnSearch" type="button" value="Search" style="width:100px"/>
            <input id="btnReset" type="button" value="Reset" style="width:100px" />
        </td>
    </tr>
</table>
 
    <div id="GridviewData">
    <div id="result"></div>
    </div>