Droped on Valve leaderboard while winning

[Kubulina]

THIS MIGHT NOT BE A BUG BUT
I have never experienced something like this before

Yesterday I was rank 77 (EU valve leaderboard)
Today
My net gain was +2 wins so I was assuming I will reach higher position
Today I woke up and see I fell by 70 slots??
I don't assume other players performed that better - this should be only possbile with me doing +15 games LOSE STREAK

The only thing changed is I started playing more Paige than Dynamo, nothing else (playstyle is the same).
Im a support player if that matters (I gainless souls/min on purpose, for being more active on map)



EDIT: Now is 262


Is this some form of bug or what is happening there?
Can someone from dev team explain it to me?
Do I really performed THAT BAD?
Does some one else experienced this?

 

[Calico's cat]

Why do i feel like performance based mm is back again? I played wallbreaker victor, won 2 games, didnt rank up (i had negative k/d but a very high objective dmg), i lost one and i deranked. Then i got placed into a few lower ranked lobbies and stomped them hard on calico which gave me a rankup on each. When i didnt perform as well and i lost on her i dropped a rank again. I would be fine with this otherwise but the devs didnt note us about changing mm.

 

[Mr.Fox]

It should be a combination of both. If i die keeping 3 enemies busy and my team gets a walker or an urn because of that, i might have gone negative and done no objective damage but actually played a pivotal role. Vin/loss should matter. And individual performance as well.

Why do i feel like performance based mm is back again? I played wallbreaker victor, won 2 games, didnt rank up (i had negative k/d but a very high objective dmg), i lost one and i deranked. Then i got placed into a few lower ranked lobbies and stomped them hard on calico which gave me a rankup on each. When i didnt perform as well and i lost on her i dropped a rank again. I would be fine with this otherwise but the devs didnt note us about changing mm.