Why is my decelerating char doing a jittery dance

i have more or less standard dedicated server rts setup, with point and click controller. By this i mean the following character non-default variables are set:
-use controller rotation yaw set to false (Character)
-orient rotation to movement set to true (Character Movement Compoenent)

The problem i’m facing for quite a long time now is that my character is doing a dancing routine, but only on certain spots on the terrain. It really doesn’t matter if the terrain is steep or horizontal, it’s just random. I’m attaching the video and my navmesh setup.

I think this has to have something with the acceptance radius. I made a huge acceptance radius of 2m (so it’s more visible) but at some points on terrain it just slides through the acceptance radius and then tries to go back.