There is a bug with the projectiles. If you shoot with a musket, crossbow, blunderbuss or blowgun at a wall the projectiles will jump back to the position where you shot from. This is only visual you can still pick them (crossbow and blowgun) up from the wall. After maybe 20-30 sec the projectiles disappear (bolts and darts too!!).
Edit: The darts and bolts will also double (survival mode) because you don't loose them when you shoot but you can still pick them up from the wall until they disappear after these 20-30 sec
I know, it is a very annoying bug indeed. But I noticed it is exactly the same with vanilla arrows. Again, I blame Forge.
And another thing: Why is the gold bayonet musket craftable with all knives?
Truly the Golden bayonet musket is the end all, be all of minecraft warfare. Why need anything else when you can dazzle your enemies with golden flourishes and then shoot them? It is the only weapon that can both kill and go with your sunday best!