Please make sure that you are using XHML DOCTYPE on that page - our controls are built upon the MS AJAX framework that uses this DOCTYPE and they rely on it to be properly displayed and positioned on the page
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
If this doesn't help, please open a support ticket and send us a small sample project where the problem could be reproduced so we could investigate your case further.
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