Time doesn't stand still in Sudoku

Why does time not stop after solving daily sudokus, even though the sudoku has already been solved? I wouldn't complain if it were a one-time problem, but it has happened to me several times. Most often with 6x6 sudokus. I usually use Google Chrome, occasionally I tried using IE in Vind, but the same problem occurred with that too. Some days everything is OK, but the next day the same problem can occur with up to three sudokus. Is this just my problem, and can anyone suggest a more reasonable solution than "refreshing" and partially solving the sudoku again?

I have had this problem, but rarely, maybe once in a month or so. And in that case, refreshing the page has really seemed like the best solution. Unfortunately, I can't say for sure why, there are several possible reasons. I myself switched from Chromium (the source program for Chrome) to Firefox in Windows because the former had some problems. Firefox has behaved noticeably better in Windows so far. However, I still use Chromium for many other sites and it is generally fine, but with some more specific sites, one browser interprets the source code better than the other, so to speak.