Solo/Duo game not gaining lp/promoting after win, past ranked history also incorrect

I won my most recent ranked solo/duo game, the last one to promote to gold 5 again, but nothing happened, it just said victory or something like that, the other people in the post game lobby also claimed they did not gain LP. When I went to my profile page, it said my highest rank was gold 1, which is incorrect. It also said my flex rank was gold 4, which is also incorrect since last I played I just promoted to gold 5 on flex.