Like I mentioned below, since this mod was edited by l4dkk, it tends to have broken animations if you play it on dedicated servers. Try to play it on local servers instead, or single player for that matter, since that's what l4dkk always mentions on gamemaps.

The mod have so many bugs on the body in general. Please fix it

Hate to break it to you but I can't rig models to save my life, this mod edit was done by someone else besides the original creator. Also, l4dkk's survivor mods to tend to have broken animations when playing online, so you have to play either single player or host a local server so you don't experience what you've been seeing.

When playing online with 8 people, the model likes bugs in the middle of the channel. Please fix it.