This is indeed a odd issue and unfortunately from the provided details I am not able to determine the exact cause of it. To progress in our investigation, I suggest you prepare a stripped working version of your project and send it enclosed to a regular support ticket. We will debug it locally and will get back to you with our findings.
You may also test your configuration beforehand with the latest internal build (LIB) available under your Telerik account to compare the results.
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