I'll donate you self mined 2 MAX if that helps you a bit, but there's really nothing more I can do, from the logs everything looks perfect, as you see. I did not had similar requests, so I guess it was a single issue.
icaros had the same problem. And I'll be asking around to see how many others are missing coins as well, I'll ask them to report them here.
Did he also use a mcxnow address directly ?
Yes, please, I already tried to find some people with similar problems but could not find any, I'm currently watching the logs of (all) transactions and see absolutely no problem at all when I compare frontend and backend.