Twitching of UI element

Hi, I have a problem visible in the video below. The UI Image (green rectangle) that should follow the position of the other airplane, is twitching.
The Image belongs to a Canvas that is a child of the NPC airplane (but when the Canvas is detached and do not move, the problem still exists). The airplanes are moved in FixedUpdate with AddForce.
The Image is moved with:

Code (CSharp):

1. myImage.rectTransform.position = Camera.main.WorldToScreenPoint(myUnit.transform.position);

Any idea what can be causing this and how to fix it?

 

Necroanswer:
Try disabling pixel perfect setting for canvas. Solved for me.