Sorry to hear that! The bug is kind of surprising, since the game hasn't really been updated or changed since quite a while (years), and that's the first I hear of a saving issue like that.
Using another browser might help - or playing using one of the downloadable executables, if you bought the game. I'm afraid I can't offer much help otherwise, since I don't have the right hardware to try and reproduce this (my Mac is too old for Monterey), and the issue seems to be somewhat specific to your machine.
