I played my 10 placement games and lost 1 (because someone through someone threw) but after those games i only started to gain 25 elo after the placements instead of 90+ elo.
Hi, jeoffreygt!
Welcome to the forums and sorry to hear that you are experiencing this issue with ELO.
The dev team are aware of this issue and it is currently under investigation.
Apologies for any inconvenience caused.
Thank you.