1600 given 2250 game rating ?

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SquareMileSummer

https://www.chess.com/analysis/game/live/133035587515?tab=review

review said I played like a 2250 level Blitz player, which is 600 points above my level

is this common or rare ?

JETINATE
Pretty common
Ziryab

happens a lot. how else do you think a 1600 beats a 1700?