Are you playing on the itch.io app? Because if so the app and the save setting are not buddy buddy. There is no other way to fix it as it isn't a bug, it's just the itch.io app not liking the code for some reason, it works on everything else though.
Both Chrome and Firefox are good. I'm sure Safari is too but I personally don't use that browser to test the game. From what I have heard others say, literally just not playing the game using the app fixes the problem. Still playable on phone and everything, it's just the app itself.
