The audio isn’t coming through for me on multiple clients so I can’t really tell what’s going on from the video, but it could be that something got between the follower and the baseplate where the spring is. You could try emptying the magazine then taking it apart by removing the baseplate.

If you’ve never done that before there should be some sort of button on the bottom (you might need some sort of tool like a screwdriver that fits to push it in), push that in and slowly slide the baseplate forward. Be careful not to let the spring shoot everything across the room though 😂