There are three reasons: First, your network is too poor, just change to a better network. Second, WeChat freezes. Restart your phone and check. The third reason is because you changed it in the wrong way. Regarding how to change your personalized signature, I will share the method with you.

The software version is: 8.0.33, mobile phone model: oppoReno7.

The operation process is as follows:

1. Open the WeChat software on your mobile phone, click on Me in the lower right corner, and then click on the personal information box above to enter.

2. Then click on more information below to enter.

3. After entering, click on the personalized signature.

4. Then delete the old personalized signature.

5. After entering the new personalized signature, click Save in the upper right corner.

6. When you return, you will see the personalized signature you set, which means your change was successful.

Under the avatar in your circle of friends, you can also see the personalized signature you set.