Some people's messages on mobile QQ can't be displayed, only one box is blank. But messages can be copied and pasted. Look, it's also in the chat log.

Information containing illegal or sensitive words will be automatically blocked;

Or the information sent by others has no content, just enter a space;

It may also be the problem of network speed, and bad network messages will be delayed or completely unable to load;

It is also possible that the memory of the mobile phone is full and there is no room for more content.