Hi Jp Maxwell,
Well, this issue seems strange and it has not been reported by anyone else. Please, try to exclude your own styles from the project, because and see what happens. Also, remove the FormDecorator from the page, and check the result. Force the desired CSS font-size of your table cells with !important. If none of these fixes the issue, please, send us a sample project that includes RadFormDecorator, your layout and styles. Also, make sure that you are using an xhtml doctype, as our controls perform best in standards compliance mode, and issues may arise in quirks.
the Telerik team