Sorry i;ve been asking a lot of dumb questions lately, i promise this is my last one for a while.

After examining my ride more closely, a can see my chainline is clearly out of whack--i dont know how this can be--I've got formula hubs on my otherwsie stock bianchi pista--the measurement match up, so i dont know whats wrong--the cog is too far out. Here comes the dumb question--there looks like there is a small ring between the cog and the edge of the hub where the threading starts--i had some guy at an lbs install the cog and lockring so i dont know if he used a spacer---is this a spacer? I mean, cogs are flat--they don't have a cyclindrical ring on one side, right? I know this is a dumb question but there is only 1 lbs w/ mechanics that really knows about track bikes up here and they are booked this weekend for repairs. If its just a spacer i'll have the dude that installed it just take it off--otherwise i have to drive 30 mi to (Sk)Appleton to an lbs who knows about track bikes.