Well this happens everywhere and not just with Xunlai.
Allmost every npc.
Dont mind the black arrow
The npc runs to a spot, the jumps and teleports back to the first place (where it runned from).
The route is the red line
And Remember its every NPC in some places in others theres only 3-6. In cavalon its like 1 big Jumping party! Imagine every NPC in Cavalon running back and forth while jumping..
I have seen this in my guilds hall ages ago. The Guild Lord along with a few other NPCs that had been bought appeared to be leaping out of the walls landing in their original place and then repeating it (our hall is the imperial isle so the guild lord could be seen running through the gate and jumping).