Ragdoll physics falling below floor

Hi

I’m still pretty new to this but I have started trying to add ragdoll to my AI. The issue I have ran into is on a new skeleton I have made while the old one I got through Mixamo works fine. I have both mesh collision presets set to Ragdoll however my new one seems to start simulating physics under the ground and then slowly rises back up. Does anyone know if this is something I can fix in UE5 or do I need to go back to where I made the skeleton and edit something there?

Thanks