Character glitching on Ragdoll

Hi, I have several NPC Characters with a ragdoll in my scene. The Ragdoll currently is blocked by the animator and gets enabled when disabling the Animator. I also use the third person controller "Overlord" from the Asset store. But when I collide with one of my Ragdoll characters, the player gets glitched on top of the Ragdoll. I'm sure, this issue is being caused by the NPC Character, because it also glitched with a FPS-Controller. However, when two NPC-Characters walk towards each other they don't glitch. Thanks in advance!