Radiobutton controls not visible at runtime after deploying on the Server

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ASP.NET

Dear All,

I have a query regarding Radiobutton.

I have used UpdatePanel, ContentTemplate i have put the 4 Radiobuttons & 2 buttons controls and a Triggers (AsyncPostBackTrigger) is used.

after deploying on the server sometimes users are not able to see all the (radiobuttons).

Code is as below:

<asp:UpdatePanel ID="TimedPanel" runat="server" UpdateMode="Conditional">
            <ContentTemplate>
                <asp:Timer ID="Timer1" runat="server" Enabled="False" Interval="1000" OnTick="Timer1_Tick">
                </asp:Timer>
                <table width="100%">
                    <tr>
                        <td align="center" class="style19">
                            <asp:Label ID="clock" runat="server" ForeColor="#0066FF" Text="" Font-Names="Arial"
                                CssClass="timer"></asp:Label>
                            <asp:Label ID="lblWelcommsg" runat="server" ForeColor="#0066FF" Text="Click on Start to Commence the Assessment!"
                                Font-Names="Arial"></asp:Label>
                            <asp:Label ID="lblMsg" runat="server" Text="" Font-Names="Arial"></asp:Label>
                            <asp:Button ID="btnStart" runat="server" Visible="true" Text="Start" Font-Names="Arial"
                                OnClick="btnStart_Click" ForeColor="#0066FF" CssClass="startbtn" />
                        </td>
                        <caption>
                            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
                            <tr>
                                <td align="left" class="style19">
                                    <asp:Label ID="lblQst" runat="server" Text="Question:" Visible="false" Font-Names="Arial"></asp:Label>
                                    <asp:Label ID="lblnoofquestions" runat="server" Font-Names="Arial"></asp:Label>
                                    <asp:Label ID="lblCount" runat="server" ForeColor="Red" Font-Names="Arial"></asp:Label>
                                    <asp:Label ID="lblQNo" runat="server" ForeColor="Red" Visible="false" Font-Names="Arial"></asp:Label>
                                    <asp:Label ID="lblSUBID" runat="server" ForeColor="Red" Visible="false" Font-Names="Arial"></asp:Label>
                                </td>
                            </tr>
                        </caption>
                    </tr>
                    <tr>
                        <td>
                            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
                            <asp:Panel ID="pnlQuest" runat="server" Height="246px" Style="margin-left: 40px;"
                                Width="805px">
                                <asp:Label ID="lblQuestion" runat="server" ForeColor="#0066FF" Font-Names="Arial"
                                    CssClass="label"></asp:Label>
                                <br />
                                <br />
                                <asp:RadioButton ID="RadioButton1" runat="server" GroupName="ans" Visible="False"
                                    Font-Names="Arial" CssClass="label" />
                                <asp:CheckBox ID="CheckBox1" runat="server" Visible="False" Font-Names="Arial" CssClass="label" />
                                <asp:Label ID="Option1" runat="server" Text="" Font-Names="Arial" CssClass="label"></asp:Label>
                                <br />
                                <br />
                                <asp:RadioButton ID="RadioButton2" runat="server" GroupName="ans" Visible="False"
                                    Font-Names="Arial" CssClass="label" />
                                <asp:CheckBox ID="CheckBox2" runat="server" Visible="False" Font-Names="Arial" CssClass="label" />
                                <asp:Label ID="Option2" runat="server" Text="" Font-Names="Arial" CssClass="label"></asp:Label>
                                <br />
                                <br />
                                <asp:RadioButton ID="RadioButton3" runat="server" GroupName="ans" Visible="False"
                                    Font-Names="Arial" CssClass="label" />
                                <asp:CheckBox ID="CheckBox3" runat="server" Visible="False" Font-Names="Arial" CssClass="label" />
                                <asp:Label ID="Option3" runat="server" Text="" Font-Names="Arial" CssClass="label"></asp:Label>
                                <br />
                                <br />
                                <asp:RadioButton ID="RadioButton4" runat="server" GroupName="ans" Visible="False"
                                    Font-Names="Arial" CssClass="label" />
                                <asp:CheckBox ID="CheckBox4" runat="server" Visible="False" Font-Names="Arial" CssClass="label" />
                                <asp:Label ID="Option4" runat="server" Text="" Font-Names="Arial" CssClass="label"></asp:Label>
                                <br />
                                <br />
                                <asp:Button ID="btnNext" runat="server" Visible="false" Text="Next" Font-Names="Arial"
                                    OnClick="btnNext_Click" ForeColor="#0066FF" />
                                <asp:Button ID="btnPrevious" runat="server" Visible="false" Font-Names="Arial" Text="Previous"
                                    OnClick="btnPrevious_Click" ForeColor="#0066FF" />
                            </asp:Panel>
                        </td>
                    </tr>
                </table>
                &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
            </ContentTemplate>
            <Triggers>
                <asp:AsyncPostBackTrigger ControlID="Timer1"  EventName="Tick"/>
            </Triggers>
        </asp:UpdatePanel>

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