Control stick snaps back hard it makes an input in the other direction

My control stick snaps back really hard, possibly because it is just loose in some way. Notably pressing down hard and releasing (flicking) it really hard can cause it to snap back beyond the dead zone and cause an up input (causing a jump in ssb melee). I tried simply switching the grey stick for another but the issue is still there so it isn’t as simple as just replacing worn out rubber. I assume the plastic stick underneath needs a repair somehow. The stick also seems to have a slight drift to the left, though I don’t notice it on the menu only when doing moves that can be b reversed and sometimes it just automatically reversed to the left, like it is stuck slightly in the left direction. I’m assuming this is the the same issue or is connected to the other issue.