How to synchronize Android accounts?

Google account synchronization, subject to the final processing time. That is to say, the operation time on your mobile phone is 13:05, while the operation time on your computer is 13:00, so the synchronized contact person is subject to the operation on 13:05. In other words, you deleted five numbers on your mobile phone at 13:05, and then synchronized them, so five numbers were missing from your computer account.

You can try if you don't believe me.