When my friends and I que for 3s (Arranged Team), we noticed that our MMR does not go up. However, if only two of us que up for 3s, we noticed that our MMR changes when we lose or win. The problem becomes that when we que as a group of 3 and search for 3s our MMRs does not change which leads to us one -siding stomping the enemy team as our team mmr is equivalent to people just starting out, is this intentional?