Thank you for the elaboration.
We were able to reproduce the issue and indeed the problem applies only to scenarios when using a custom template. Also, it appears only when using specific user controls at a time. This is why it would be really helpful if you could state which are the exact controls used on this page, and the order of placing them (if it is possible for you).
Your Telerik account has been updated for reporting this issue.
Thank you for your time.
the Telerik team