Since it is a hack, and your are using weapons that you should not, the game can get stuck. There is no solution for that.
As explained in the About->Weapons:
CUSTOM WEAPONS:
They will be added to subweapon menu (UP/DOWN D-PAD).
After selecting a custom weapon, you must enter inventory menu
to select another weapon (Y, RB)
NOTE: Some weapon-character combinations can cause problems when
reloading and/or changing weapon mode. Avoid doing it!
FAST FIRING:
If you used 'Increment stock' option you can fire without reloading for a while,
but you must not reload (X) or change weapon mode (LT + Y).
If you want to select a different weapon mode (i.e.: normal/explosive arrows),
do it from item menu BEFORE using the weapon.