This is in the last version of IE that comes with Windows 8.1, but I know that even prety older version have the same problem. All textiput fields were affected - in the login form, in the cart, etc. I fixed this by adding min-height: 35px in
select,
textarea,
input[type="text"],
input[type="password"],
input[type="url"],
input[type="email"]
of gavick's joomla.css