I honestly do not know what could be happening. I tested on unity's editor, and there are no errors thrown, I checked the scripts and they look fine, and finally I uploaded a test build to my website and it worked just fine(Windows 10, Chrome 112)...
Might I ask, what browser(name and version) are you using? And would you be able to reload the page cleaning the cache(CTRL+F5) to try again? Just as a reminder though, BEFORE doing so, create an account on my website, login in game and upload your save to it to ensure you won't lose it.