What the hell is going on with matchmaking, I got 4 wins in a row due to forfeits, in DIAMOND!

Yo guys!
Im playing some BGs since those are the last hours and dude, I was playing with similar accounts for a while, Im an average Paragon I guess, 5 R4s, 5 7* for BGs, and the rest R3s, good ones but still R3s, and suddenly after reaching Plat I, I got matche with people that had maybe 3 6*s and fulls 5*s, or just R1 or R2 6*s, obviously after seeing the big difference on both rosters and champions they forfeited, so Im at Diamond II suddenly only with one win basically.
Kabam, idk what are you doing but dude, first of all, how can those fams be in Plat with that roster, and how they are playing vs me.
Im playing some BGs since those are the last hours and dude, I was playing with similar accounts for a while, Im an average Paragon I guess, 5 R4s, 5 7* for BGs, and the rest R3s, good ones but still R3s, and suddenly after reaching Plat I, I got matche with people that had maybe 3 6*s and fulls 5*s, or just R1 or R2 6*s, obviously after seeing the big difference on both rosters and champions they forfeited, so Im at Diamond II suddenly only with one win basically.
Kabam, idk what are you doing but dude, first of all, how can those fams be in Plat with that roster, and how they are playing vs me.
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Anyway, still feels weird that those accounts reach to Plat/Diamond, obviously Im all in for some easy wins after getting it hard vs stronger rosters.