I am not logged into QQ, but a message pops up in the QQ space saying what is going on?

Hello, there is a possibility:

It is automatically pushed by QQ official, please look carefully at the content to see who sent it

Your family Or a close friend knows your QQ password and logs in to send it, but you don’t know

QQ on mobile phones and tablets often logs in automatically by default. You accidentally touch the screen with your finger and send the message. Function, in this case the content is usually empty or has meaningless characters

Your computer or QQ is infected with a virus.