time issue
You likely have higher lag. Premoves take a minimum of 0.1 second and could take longer. So if you're experiencing higher lag or small disconnects, you could see time decreasing.
If you look at the Hanes in your archive, you should see the 1 second being added after each move
You might check out the following minimize connection issues.
https://support.chess.com/en/articles/8652402-how-can-i-optimize-my-online-chess-performance
https://support.chess.com/en/articles/8584209-how-do-i-fix-my-disconnect-lag-issues