Replying to help binding Mount Qs

Hey I just bought a pair of Atomic deep powder rock skis. here is the thing. The bindings are mounted a not in the middle of the ski but an cm off closer to the side of the ski. Does anyone know why.

I know I have to get the things remounted cause the skis are mounted differently (ie both pair mounted more to the right side) and (knew before I bought) but when I remount them does anyone know why they wouldnt be mounted in the middle.

specs 135 115 125

They are used heli skis and they were only mounted once done this way.
P.S. JAPAN HAS SICK POWDER