You may be experiencing a lua error when playing a server using this mod. It is common and can effect performance and can even crash servers. I highly suggest for the creator to either update the script or add a debug command for servers. Otherwise, you won't be able to fix it.

Theres a better option though, theres a mod called advance visual clip. It doesnt have any errors but is advance, as the name suggests. I suggest trying to learn the mod and then switching over when you are more than experienced with the advance visual clip tool.