I tested locally and didn't have any issues, this may be an accidental situation.
At currently, there are only two ways to modify it. Show or hide columns or Edit current view.
For this case, I would recommend trying the show or hide feature in a new list to see if it still persists.
If that's the case, I recommend modifying it with the Edit current view option.
Here is a previous post for your reference: https://techcommunity.microsoft.com/t5/sharepoint/lists-column-hides-bug/m-p/3136309
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