I think I may have noticed something, finally!
Here and here:
You are using “Left Mouse Button” input in two places. Try to eliminate that by adding the reload code TO the one that goes to “Switch on E_Firing_Mode” so if you try to click:
First it checks to reload.
THEN it shoots if reloading doesn’t need to happen.
It’s possible that the multiple inputs being sought was consuming the mouse or something along those lines. 