issues in filament loading in Bambu Lab AMS lite

my 3rd slot for the Bambu Lab AMS lite will not auto load the filament to push the filament inside as well is slightly difficult and requires more force than the other slots. the motor is working as when I manually feed the filament and tell the printer to load the filament it does load the filament for printing and I can print as well but the autoloader wont work anyone have any idea what the issue could be ?