A mix of standing and moving animations but the upper body is shaking very hard

Hi, I’m very new to Unreal Engine.
I have a vexing problem,When I was mixing two animations,the upper body of the model will shake violently, which made my first person camera look very bad,What should I do Walk_BS(in the picture,control move.)works only in the lower half of the model,makes the first person seem to move more smoothly.
Hope to get an answer thanks.