I'm going out on a limb here and saying that this is a CSS issue.
You're referencing a CssClass
called round
- Ideally we would need to see that first.
Though I am going to guess you have a .round:focus {}
too? to style the currently focused textbox. If so, this isn't supported in less than I.E 8 and will likely have some funky behaviour...
If this is the case, then check out ie7-js to help you gain missing support.