actor component makes my character tremble when I walk on it

Everything is in the title, in my actor I have several instanced staticmesh component and all went well, until I add the lights that you see in the video (and the particles). any idea of ​​what could be causing this?

video : https://www.youtube.com/watch?v=DVoCltDNI-w&feature=youtu.be

Edit: Particles cause the problem

Hello,

We’ve recently made a switch to a new bug reporting method using a more structured form. Please visit the link below for more details and report the issue using the new Bug Submission Form. Feel free to continue to use this thread for community discussion around the issue.

https://forums.unrealengine.com/unreal-engine/announcements-and-releases/1410408-unreal-engine-bug-submission-form

Thanks