Ps5 controller r1 button stuck

Ive taken apart my ps5 controller to fix a stick drift and i put it all back together to find out the r1 button is sticking ive taken the button out and cleaned it and nothing ived also checked both sides if there was any damaged or differences and ther was none the only difference ive noticed is i would press down on the rubber piece where the trigger presses it feels much softer than compared to the l1 side