We are not aware of such an issue, and the provided information does not suggest what might be causing it.
Can you please check out the following working example, and apply the necessary adjustments to your implementation:
If the problem persists, please send us a similar isolated runnable project, where it can be observed, so we can inspect it further, and provide more to-the-point suggestions, relevant to the specific scenario?
Thank you in advance.
Telerik by Progress