small classes jumping in combat

[lanystvyl]

I noticed that the rats and gnomes and all the smaller animals and races that I attack seem to jump up and down really fast. when they flee they return to normal, seems like its only when they are fighting back. when not engaged the are not hopping or falling from the sky. is this a distance issue where the npc is to far away or to close to the PC? Im not sure how to correct something like this as there are a lot of npc's that seem to be affected. i tested this in titanium and rof2 with 2box side by side to see if it was just the client but i see the hopping on both monitors.

I just installed the server from akka's installer for ubuntu.