@Polnonica - the Date column is editable - so you could change it back again.
Or, you could drag the format file from the 'bad' book's folder (e.g. the one with the EPUB) into the book details panel of the 'good' book; or copy the format to the clipboard with Ctrl+C, and then use the Add books->Add files to selected book from clipboard option. Then remove the 'bad' book.
Merge never seems to do as I expect, so I always do it as described with Ctrl+C and Alt+Shift+V (custom shortcut).
Tip: press 'O' to open the selected book's book folder.
BR
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