Why are some of my QQ messages sometimes on the computer but not on the mobile phone, and sometimes on the mobile phone but not on the computer? It's just that I often get less information.

When the computer is connected to the Internet (when the mobile phone is not connected to the Internet)

It is computer reception;

When the mobile phone is connected to the Internet (when the computer is not connected to the Internet)

It was received by a mobile phone;

When computers and mobile phones can access the Internet,

Sometimes it is computer reception (when the computer network is relatively fast and stable, but the mobile phone network is unstable or slow to receive, it is not received or received less)

Sometimes it is received by a mobile phone (just the opposite of the above)