SurfboardHahaha, a half a centimeter won't make a difference at all... Also at that little a difference there's also a very good chance you measured wrong.
BumpzNtreesIt is very common for the mounting lines that are printed on the topsheet to be incorrect for any brand of ski as far as i know. I have a brand new pair of revisions and the center line on one ski is a whole centimeter in front of the other ski. Most tech's will disregard the lines and measure with a tape. Chances are, your bindings were mounted where you asked and the lines are incorrect. Also, totally possible that homeboy at the shop totally fucked up.
Your boot has a center mark, usually an arrow. Click your boot in and measure with a tape and you will know for sure.