blitz improved but not puzzle storm/racer

Hi everyone,
recently I heard that puzzle storm/racer or puzzle rush on chess.com is good for your blitz chess.
I have been doing ok in blitz but my puzzle rushes haven't gone up at all, well sometimes when I do them I feel smoother at the beginning but the results are still the same. Is there are a problem?

@Aiden_Chen It's quite hard to improve in puzzle storm (or puzzle rush) because at the end of the day mouse speed is also a factor. It's mainly for fun.

Normal games start with your army at one side and other army at the other side but in puzzle they randomly give you a position out of a game and you have to quickly find out the best move , though it is easier in storm but due to its time limitations , sometimes you blunder .