What's the matter with the white bars in the WeChat chat dialog box in the dark mode of Huawei's mobile phone?

There are white bars in the WeChat chat dialog box in the dark mode of Huawei mobile phone for the following reasons:

1. Software problem. The downloaded third-party software conflicts with the system.

2, mobile phone water will also lead to white bars on the screen and touch screen failure.

3. The cable connected to the display screen of the mobile phone itself on the motherboard has poor contact.