Yes. Restarting the phone doesn’t fix the problem. I only use Big Sur for testing but yeah, not looking good.Well, I'm guessing they're pulling from different sources, plus then the weather widget might be behind a little bit too (can't tell for sure, as the clock is cropped out). I see differences in temperature between Dark Sky, Met Office and stock Apple one.
I had that the first time after getting Big Sur installed, then not since. Are you getting it every time?