In my site, I cannot type in textboxes on IE11 on Windows 7. Clicking the text input field, I can see the caret blinking outside the field, positioned in another place in the page. I can reproduce the problem across many computers with IE11.
Setting IE8 via Inspector solves the problem, with IE >= 9 it shows the problem. The site uses Twitter Bootstrap. I tried z-index fixes without success.
Site link: http://fortis7.moutheme.com/
I managed to fix this issue by giving it a height
.