I "Think" the pool mines the algo (lyra2v2) and you get paid for all lyra2v2 coin you mine then the pool exchanges them all for vsync.
I use the same pool and was confused too. i watched hard to figure out what was going on but im doing well on zpool
Vsync and Bitsend using lyra2v2, they using xevan algo. Do you guys set currency symbol in your command line? Because i see possible reason on main pool page:
If no c=<SYMBOL> is set, your currency will be randomly chosen from any matching coins we have used.
So show your bat files or how you run mining.