Textbox conflict

Hello everyone,
I can't figure out what's happening here.
I'll start by saying I've this issue only using IE (I tried IE10 and IE9).
Following code allows users to save the username-password associations
<asp:Login runat="server" ID="loginForm" > <LayoutTemplate> <asp:TextBox ID="UserName" runat="server" ></asp:TextBox> <asp:TextBox ID="Password" runat="server" TextMode="Password"></asp:TextBox> <asp:Button ID="LoginButton" runat="server" Text="Login"/> </LayoutTemplate> </asp:Login> Following code doesn't
<asp:TextBox runat="server"></asp:TextBox>
<asp:Login runat="server" ID="loginForm" > <LayoutTemplate> <asp:TextB ...