Unfortunately I'm unable to re-create the described behavior locally from the given details. I have attached a simple test page, please take a look maybe I'm missing something obvious.
Also you may consider sending us (attached to a formal support ticket) a small runnable project in which the behavior can be observed. This way we will be able to gather more details about your case and implementation and provide you with more to-the-point answer.
All the best,
the Telerik team