Xbox one controller only fault with thumbstick

Hi, I bought a joblot of xbox one controllers off ebay and one of them had bad stick stick drift so in I replaced both thumbsticks and now only one of the thumbsticks work but the other doesn’t. So inspected my soldering work with a magnifier lens as I don’t have a microphone and I noticed there’s a capicator missing near the thumbstick. I was just wondering would that one capicator cause the thumb stick not to work, but the strange thing is it works when you click down but not when you move it’s left/right/down etc.