I think the easiest way to search is to press CTRL + F to bring up the Find Results bar, then type the node name in there. It’ll search the whole BP, so it’ll find it even if it’s hidden in an event or function.
If that happens when your character touches the other skeletal mesh, there might be an event inside your player character that tries to add a force when colliding with something else. Let me know if you can find the AddForce node inside the BP.
And yes, if you Simulate Physics in a skeletal mesh, and it has the PhysicsActor collision type and a Physics Asset assigned to it, it’ll ragdoll. Assuming you don’t want that, the best thing to do is to find that AddForce node and remove it, or filter it to not consider skeletal meshes. I hope that helps!