The behavior from the screenshot could be caused by custom styles altering the default Grid appearance. Would you remove any custom CSS that is applied on the page and see how the behavior changes?
Also, in the ticket information it says that the version you are using is not the official release. Try referencing the resources from the official release (2019.1.514) and see if that makes a difference.
In case the behavior persists please send us a runnable sample where the issue is replicated. This will enable us to examine the issue and look for its cause.
Regards,
Viktor Tachev
Progress Telerik
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