Xbox 1914 controller RT/LT at 100%

So hopefully someone can help me. I changed the potentiometers on 3 of my sons controllers. They’re all model 1914. However on the last one the trigger buttons are constantly at 100%. They weren’t doing that before I worked on them. I never done anything different from the first 2 controllers. Everything looks fine. There’s no broken bits and the magnets seem fine. I’m thinking it’s the sensors. Any help would be grateful. Cheers John