As stated in the provided help article,
the wrapping element of the RadButton control is relatively positioned, so that the Primary and Secondary icons can be positioned absolutely toward the wrapper. Older versions of Internet Explorer may overlay incorrectly the relatively positioned element over all other elements on the page, which results in fixing the element to a certain position. This is commonly know bug under IE and reports for it can be observed on numerous articles over the Internet, for example this one
The solution of the problem, as shown in the previous post, is to set position: relative
to the parent element of the RadButton.
The RadButton, containing relatively positioned elements, hits this IE bug, while the standard asp button, being a simple HTML element does not trigger it.
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