Hello Ross,
The described behavior could be caused in some cases when several subsequent requests are made before waiting for the return vale.
However as the provided information is not enough to isolate the root cause of the issue you are facing, please prepare a simple, fully runnable reproduction demo, open a new support ticket and send it to us along with very detailed reproduction steps and explanations and we will debug it locally and we will do our best to help.
Regards,
Maria Ilieva
the Telerik team
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