Sale #2 was actually for 46 pure. Creds Blaze for leading me to it.

First of all, the seller's B/O: https://imgur.com/a/gQFK5

Histories on the first 5 keys in the group don't match, and there is a small but appreciable difference in the ID# gap between keys 5 and 6, compared to any of the others. Seller likely accepted two trades in close enough succession that compare incorrectly grouped them together. Happens on rare occasion with active traders.