This “Attach Actor To Component” node is heavily bugged although it’s very useful, same as the “Attach Component To Component” node, if choose the “Snap To Target” location rule option of this node, while attaching something to character’s any spine bone socket, and the character will do weird dancing or sky walking, 100% replicable bug and it’s funny to watch but can’t figure out the reason.
Edit: Solved this by turning the collision off for the attached object.