When you use an addon no matter what kind of addon it is, you will notice (for example with a custom sword) that when you attack with that custom sword, that the animation is kind of not the same as when you use a vanilla sword (maybe it is offcenter or I don't know)

Steps to reproduce:
1. Install an addon
2. try It in a world
3. Compare the punching animation with a vanilla object to another object that was included in the addon
4. You will notice It is slighly different and It occupies more space in the screen when punching/minning with It