as of today ( 29th April, 1130 UTC ) my highest ever rating is 2221 ( my current rating ) ,but when looking at my profile it displays 2215 as my highest rating. I believe this bug was caused due to the fact that my 2221 was achieved from defeating a ~2200 player, adding 6 points to my earlier rating of 2215. but actually, my rating as displayed during the whole game was 2209, due to a loss earlier in the day. said loss was to an account which violated ToS, so midway during the game when the account was banned, I got a rating refund of 6 points, and a bit later, an additional 6 points from the victory. that made my rating go from 2209- 2215 ( from the refund ) - 2221.
