The described behavior might be related to the following: we use two event handlers to synchronize horizontal scroll offsets - one for the Grid data area and one for the Grid header area. Normally, the handler for the header area would not be needed, but we added it to address some edge cases, such as automatic scrolling during column reorder, or searching for text in the headers with Ctrl+F, which caused cell misalignment in the past and generated support tickets.
I can show you how to detach the header handler. Please execute this script after the Grid is created:
Telerik by Progress