There might be other problems, but I would first detune the skis. They come tuned, but they have to be detuned at the tips and tails. (Some prefer not to detune.) Sometimes shops forget to detune. Take a bastard file and take about three rolling, forward strokes at the tips from about 1/2 inch back from the contact point (snow to base)to the point of the ski, each side; and also do the same with the tails. Increase the 1/2 to about 1 to 1 1/2 for beginners and intermediates.
Draging your fingernail across the edges should take off a bit of fingernail (backside). Doing so across the detuned areas it shouldn't take off any.
Also, is the binding on that ski aligned correctly? Loose? Is the ski warped? have the shop lay the ski on a flat table. Does it lay flat or does it rock back and forth like my-sister-Kate? This may be the real cause! I had a set of old Heads once. One ski was flat- no camber left in it, the other was warped. They were a lot of 'fun' to ski!!! Full of surprises! They were fixable for $15, but that was back in the 60's-70's and they were metal skis.