Ranking reset

i was playing halo 3 playlist today on Halo MCC and after one game i was randomly reset from a rank 13 to a rank 1 after winning the game

Same thing just happened to me today in Team Hardcore

Sucks I was a level 25 in H2C, an lost a game an my rank reset too :angry::unamused: I gotta make my way back to that now… :anguished: