If the spoon (white thing) and peg (red thing) under the playfield are CLEAN. Disassemble and clean with isopropyl alcohol. As mentioned above, make sure the peg is aligned in the spoon well during reassembly.

I find the pushing the spoon up towards the peg is helpful in centering. If the peg moves one direction or another when you push the spoon towards it it, then it’s not centered.

It’s also good practice to remove the spoon switch assembly from the underside of the playfield, clean the spoon and peg with rubbing alcohol, adjust the switch gap, reinstall and center up the spoon, and do a final tweak of the switch gap. I’ve never had this process not fix this problem. Make sure your game is turned off though.