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@44reader - it sounds like you don't understand what that check is for. Have you read the help file by any chance? (Not being facetious - just wanting to know if my explanation there needs enhancing).
A "replaceable" cover is a *good* thing. It means that when you use save to disk/send to device (or the Update metadata option in Modify ePub) that calibre will replace the cover in the ePub with the latest cover you have given the book in your library. So you ran the check, it told you it was possible for that book to have its cover replaced, then you ran Modify ePub and replaced it. It isn't telling you that the cover *needs* replacing because it is a different image, it is just telling you that it "could" be replaced. Hence why you run the check again the book shows up again.
Whereas the Check non-replaceable cover tells you that running "Update metadata" or save to disk/send to device is *not* going to be able to replace your cover image. The only way around that is to use the "Insert or replace cover" option in Modify ePub, or do a conversion in calibre (the former the preferred option).
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