1. Hide setting: You can set the personalized signature of WeChat to show or hide. If the personalized signature is not displayed, it will be set as hidden. You can go to the "Personal Information" option on the WeChat settings page, and then go to the "Personal Signature" option to see if the personalized signature is hidden. Once it is hidden, you need to set it to display.

2. Unstable network connection: In WeChat, personalized signatures can only be displayed normally through network connection. If the network connection is unstable, the personalized signature will not be displayed normally. You can try to reconnect to the network, or use WeChat under the network ring.