Hi Alex,
Yes, there were improvements in this area and this issue was fixed:
https://feedback.telerik.com/aspnet-ajax/1377611-hidden-columns-are-shown-on-resize-when-the-static-headers-and-frozen-column-are-used
The frozen columns are working by changing the Display of the columns internally. It is expected for them to show up if there is enough space and the grid repaints. This may lead to this kind of situation.
We suggest that generally, you use the Visible property instead of Display when using frozen columns. Alternatively, you can hide the column on the client-side:
Regards,
Eyup
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