(PS4) 4th paddle randomly switching between ○ and L2 when playing bloodborne

My buddy gave me his old ps4 scuf controller (no EMR key or tools) and it's worked great for multiple games until I tried to play bloodborne today. Sometimes when I try to dodge or run with ○(4th paddle) it shoots(L2) instead, how can I fix this? Please help

Edit: got it to work! Had to fiddle with the fridge magnet to make sure it was in the right spot, but it works! Thanks everyone!