Thank you for the provided screenshots.
It appears that the grid has some custom styles applied to it as the scrollbars do not look like native browser scrollbars to me, please correct me if I am wrong.
Firstly, to ensure the grid with locked columns behaves as expected, ensure the requirements are met:
Then, if you still experience any styling issues, can you send us the grid configuration, including any custom CSS. It would be best if we can see a Dojo sample with some mock data or a simple HTML file. This will allow us to quickly and easily find the cause.
Look forward to hearing back from you.
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