Why does my qq become a personalized signature when we talk about it? How to cancel it?

Because your speech and your signature are synchronized, let's talk about the method of cancellation:

Open qq and click the space button above.

After opening the space, click the Settings button in the upper right corner.

Click Sync Settings on the page that opens.

If the first two check marks are removed, the synchronization between the conversation and personalized signature will be cancelled.

After the setting is completed, click OK.