Why are weapons not firing?

I am creating a gun game map and I have everything mostly complete, but when testing the map I noticed that the weapons are essentially shooting blanks. The weapons are firing but not dealing any damage. Sometimes the first clip will deal damage (after respawning or being granted a new weapon) but won’t after reloading or even after taking a few shots. I don’t have any clue as to what would cause anything like this to happen. Has anyone else had a similar issue?