Animation Glitch

Hello, ive been rigging and making a plane to animate it but when i try to move a certain part, it just moves the whole rig for no reason , this is so broken , does anyone knows why? https://gyazo.com/c5c9f389be400fef85466b2e44ebc936

The part you are trying to move is problably welded to the entire rig.

Side note, I’m not sure but I think this should be moved to Building Support.