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This is know bug, all the description of the bug is here - https://github.com/unaio/una/issues/2856 - and for there is no good fix available for it.
Temporary solution for now is to disable resizing in browser by setting "Image width to resize before upload" and "Image height to resize before upload" to "0" in Studio > Settings > General
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That’s what’s happening
It maybe looks not related, but it's actually related, you can try this solution and reply back if this helped or not.
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That seems to have resolved the issue. I know that is what I was using some time ago to resolve image sizing as I would upload various covers and they would not size correctly for group covers. The thumbnails look good when you are viewing groups but when you go into the actual group they dont look right. They are too large and run off the boundaries.