about 5 years ago - /u/cameron_dev - Direct link

We discovered and fixed a bug that affected MMR change during calibration for players. The bug affected a certain segment of players based on the values of their Core and Support MMRs. The fix for this is now live, and later today there will be an adjustment to the MMRs of the affected players to bring them their correct value.

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about 5 years ago - /u/cameron_dev - Direct link

Originally posted by mr_dawg23

I just won a match and lost 4 MMR. Please fix.

MMRs of players affected by the bug have been corrected. Some players are lower and some are higher after this correction. Send me a recent Match ID and your username if you think you ended up lower than expected after calibration and I'll take a look.