I have the same problem here. My peak ranks with MMR got reset with this new season. In 1v1s last season I peaked at Diamond 1 divison 2 (819 MMR). In 2v2s, I peaked at Champ 2 division 1 (1203 MMR) at the end of last season. I also peaked at Champ 1 divison 4 (1171 MMR) somewhere in last season. Then besides that also a few extra gamemodes aren’t being shown correctly to my actual peak ranks for these playlists.
As of now, my peak ranks are shown to be Plat 3 (809 MMR) in 1v1s, Champ 1 (1157 MMR) in 2v2s and Diamond 3 (1016) MMR. These are wildly incorrect and it doesn’t give a good feeling.
Could this be solved? I will paste my RLT link underneath this message, to view my profile for proof, the section ‘Skill Rating’ will prove my peak ratings from last season.
Link: MrDisaster25's Rocket League Stats - Rocket League Tracker