Are there irregularities with 2021 year-end Mixed ratings? Let me know if you've seen some

2021 USTA League year-end ratings are out, and I'm doing my analysis and writing down various observations, and it is too early for me to make any conclusions about what is going on with Mixed (M) year-end ratings, but something seems off.  I will continue to do my research and report back when I determine anything, but if you've seen something strange, players that should have gotten an M rating and didn't, or players that got a C rating that should have gotten an M, please drop me a note and let me know.