Ok, I got how your ranks are calculated (virtual merit ranks, not current profile rank).

I recall there being three TXs undone by @theymos due to a clear hack+hacker abuse, awarded by Elwar's account while hacked. The TXs that got reversed are the following three, all performed on the 17/07/2018:

3286845.msg34284719      1531821996   50
2674194.msg36115570      1531821834   50 (the one you reference)
4416705.msg39872242      1531804428   50

https://bitcointalk.org/index.php?topic=4708873.msg42558257#msg42558257

Those 3 TXs where reverted by @theymos at the time. Anyway, being off a couple of TXs between external non-official DBs is not really much of an issue really.