Hello,
I suppose it happens only when you have RadFormDecorator on the page also? The problem comes form the width unification for all Telerik input elements, FormDecorator overrides RadInput width. The problem is fixed and will be available in the next official release - Q1, 2012, Service Pack 1, scheduled for the mid April, or in any of the upcoming internal weekly builds.
For now, you could use the following CSS fix:
Kind regards,
Bozhidar
the Telerik team
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