Sounds like the "tang" on the grip safety is not interfacing correctly with the back of the trigger bow.
The grip safety tang should physically stop the rearward movement of the trigger. When the grip safety is depressed, the tang moves up out of the way of the trigger bow, and allows the trigger to move rearward.
The grip safety tang should physically stop the rearward movement of the trigger. When the grip safety is depressed, the tang moves up out of the way of the trigger bow, and allows the trigger to move rearward.