Controller buttons won't work in PS Menu

My controller buttons (X, O, □ and △) seems to only work in the 'choose a user menu' and in the menu when u hold the PS button, but not in the 'Playstation home menu' or in the game. After I choose a user my X, O, □ and △ buttons won't work anymore. Every other button works perfectly.

I already took the controller apart to check if it was dirty or something. It's weird, because everything seems normal, and I can turn off and on the controller, go to the menu when you hold the PS button and click around there fine but when I start any game, or go back to the normal PS menu where you can choose a game/app only the X, O, □ and △ buttons won't work anymore. Is there a reason for this? Any help would be appreciated