They just use a different mathematical formula to calculate ratings. Up to about 2000, that other site’s ratings are about 200-400 points or more higher than on chess.com. The lower your rating, the more the difference between their site and chess.com's.
I am 1350 on lichess, then why am I not atleast 1100 on chess.com??
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I am like 1350 on lichess and I know there is a difference in ratings but still there I play OK and here even though it's all going good I make blunders or musclicks. Any improvement suggestions or is just some problem with this site?