A glitch of the HL2 rebel NPCs are acting wierd...help?

[JasonRush]

I recently bought a GMOD server, and I got a problem. The animations and how the REBEL npc acts is messed up. They basically do the wrong animations, or do messed up versions of it. They also do some laggy movements, such as doing a full 360 but while acting like their doing a slow motion scene. To top it off, not just the rebels are acting weird. It's also the rest of the HL2 human NPCS. But that was obvious, but the strange thing is that the manhacks and the rollermine(or whatever it is called) make no sound. I've asked people on my server if they had this problem, and they have. Is there a way to fix this problem?

Server info:
Server host-Xenonservers
-tickrate 66 (can go up to 100, but don't think this will fix it)

If you need more info, ask.

[CoolCorky]

Tried re-installing the server?

[Papa Gator]

what anims do the rebels make while idle or standing?
do you have assmod?