I deleted the light with the issue from tuya, and unplugged the light, plugged it back in, did the setup again.How did you sort the hour difference? I have the same issue
I think it was just due to having the app running for the first time when I set the first one up.
It hasn't happened to me since. I've gotten a couple more for other tanks, and have had power outages and what not without the issue returning.