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I was able to "fix it".
I installed the Kobo Extended Touch plugin. Then I wrote down (on paper!) the names of all the books that Obok brought into Calibre. About half had the cover problem (better than I thought). I deleted all the books that had cover problems and retransferred them.
It worked, although **one book** gave a repeated communication error. I don't know why that one book had the problem. (Google suggested that if someone has that problem, it's with all books.)
I can't get the Kobo to treat collections and series as the same, so from now on I'll buy Kobo books, convert them to Epubs with Obok, then *back* to Kepubs when transferring. It's unnecessarily complicated and brute force but it works.
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