Followup to posting below: it seems like something must have been corrupted; a number of my contacts were showing crazy values for dxcc_ref. I saved everything to an ADIF, started a new log, and imported the ADIF, and things seem to be sane again.

I'm not sure if this is a database issue or a user error on my part, but my DXCC stats seem just a little bit off. Specifically, I seem to have credit for China confirmed by LoTW on the 7 MHz band. This doesn't make sense as I have contacted China but only on 21 MHz and not LoTW confirmed. This seems to have started right around the time I got an LoTW confirmation from ON7TQ (Belgium) on 7 MHz. Also, I note that my CQRLOG DXCC stats page isn't giving me credit at all (confirmed or not) for Belgium on 7 MHz. My first guess is that somehow that ON7TQ contact is being treated as China and not Belgium. If I go to "View QSO" for that ON7TQ contact, the DXCC info country box says "Belgium, HF Class", the Frequency box says 7.1680, the Mode box says SSB [so all of these are correct] and yet the DXCC stat box has nothing checked off at all for 7 MHz. Any ideas?