In what circumstance does IE8 repeat words(text) in multilines textboxes?

This is a work question generalized so it can help other people with this nightmare. I deployed an ASP.net application on four PC Machines. This application asks them to enter data in many textboxes that are multiline as they LOVE to write. They are using IE8 with compatability mode that I have hardcoded into the httpheaders. The error I describe I have seen happen on their machines but not on mine.

The fields are contained in a tabContainer from AjaxControlToolkit. They have many textboxes, dropdownlists and a button to submit and save. Sometimes when they are writting the words at the end of the sentence repeat. Other times they repeat when they save.

My take on this is that it is most probably because of issues with overflow but I tested that out and it worked for a while and it broke again.

MainPage

<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="ShowAjaxError.aspx.vb" Inherits="TestForWhatever.ShowAjaxError" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt;


<%@ Register assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" tagprefix="cc1" %>
<link href="css/ajaxproblem.css" type="text/css" rel="stylesheet" />

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
    <div>
    <cc1:TabContainer ID="TabContainer1" runat="server" ActiveTabIndex="0" 
        Width="800px" Font-Size="Medium">
        <cc1:TabPanel runat="server" HeaderText="FooTab" ID="FooTab">
            <HeaderTemplate>
                Foobar tab
            </HeaderTemplate>
         <ContentTemplate>

         <asp:Label ID="Label6" runat="server"  
                             Text="Comments:" Width="120px"></asp:Label>
          <asp:TextBox ID="txtComments" runat="server" CssClass="MultilineIssue" 
                             Height="101px" Wrap="true" TextMode="MultiLine" Width="223px"></asp:TextBox>                   
         <br />
         <br />
             <asp:Button ID="Button1" runat="server" Text="Submit" />

         </ContentTemplate>
         </cc1:TabPanel>
         </cc1:TabContainer>

    </div>
    </form>
</body>
</html>

CSS

body {
}

.MultilineIssue
{
 color: Black;
 font-family: Helvetica, Arial, Sans-Serif;
 font-size:74.5%;
    text-align:left;
 border:1px #7f9db9 solid;
 overflow:auto;

}

Example input:

A gray Fox walks the land. A gray 
Fox walks the land. A gray Fox 
walks the land.

What the browser shows sometimes

A gray Fox walks the land. A gray 
gray Fox walks the land. A gray Fox 
Fox walks the land.

Keep in mind this repetition is not passed to the database.

I am sorry if this issue has already been asked I searched but couldn't find a synonym for word that didn't meant Microsoft Word. Google was no help either. Thank you for your help.

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In what circumstance does IE8 repeat words(text) in multilines textboxes?

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