The reason is that the Puzzles rating is meaningless, as it's horribly inflated.
In Rapid, the highest rating on chess.com is 2928.
In Puzzles, the highest rating is 65400.
65 400 !!?
Are you not mistaking ?
No ! Someone actually has 65400.
this happens because at the highest puzzle ratings the puzzles repeat; so all you need to do is memorize all of them.
my rating is 3000 in Puzzles!