Try restarting Douyin. If it doesn't work, delete it and then download it again.

Reasons for Douyin screen jumping:

The first reason is that you can only put one hand on the screen while using Douyin. If you put both hands on the screen, it will jump.

The second reason is that your network is unstable. If the signal is poor, it will cause the screen to jump. So before using Douyin, be sure to check whether your network is intact and normal.