Im using a gun system called FE gunkit, and for some reason by bullets go through people and don’t damage them. Can someone help?
cant really give an answer from some gameplay video, you needa post code otherwise its just guess work but heres some stuff u can try:
try it in an actual game with a friend might be because your names are the same or its filtering your duplicated character or something, or maybe try shooting a dummy.
similar post
I have tried the solutions, unfortunately none worked. I also tried the solution on the similar post but I could not find the specified script. 
It worked with the dummy, however
without code nothing we can help with you gotta find the code for bullet creation (probably raycasts or some sort of projectile manager) and hit detection before we can help with anything
Because you are probably using deprecated version. Try using a new one.