How do you fix puncher shooting?

Recently, our puncher robot’s shooter decided to die, and for some reason now whenever the magazine is full it will not shoot properly because of all the discs stacked on it. I have tried adding plastic sheets and having a smaller area at the bottom but both of those did not work. Do have any idea how to make our puncher shoot properly when the mag is full? Thanks!

We can’t help unless we have pictures. As with every other robot, parts of it(even similar ones) are never the same, so please show us what the issue is so we can help.