Hi Lim,
I am sorry you have run into this problem. There are many possible causes of this, which means we don't have a specific fix for this. If you can share with us a repro of this problem (a webpage/web application or publicly accessible website along with a test that runs against it) we'll gladly study the problem to see what can be done to solve it for your specific case.
Sincerely yours,
Cody
the Telerik team
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