In my case it's mounted on the outside -- not that I have a choice: the chainset is older Rotor XC2 with 110mm for the big ring/74mm for the smaller one.
I just measured my chainline, it comes at 51mm. (Keep in mind that I use it on an old MTB with a 73mm bottom bracket shell).
Did you mount it on the outer ring position or inner?
The wolftooth is offset so mounts on the outer, but gives a good chainline.