Ah, and apparently that “taxon swap creates maverick IDs” is reported here: https://forum.inaturalist.org/t/incomplete-taxon-swap-bug-creating-two-maverick-ids-and-no-agreeing-ids/4295/9
I wonder if the other observations in the grid you provided are all showing the same bug?
[Addendum: yep, they are. Huh, that gives them a lot of examples for that other topic]