highjacker 4in lift

[az1970k5]

So I had a shop install a 4inch highjacker lift (all spring) no block on my 70 blazer. I drove it and it drove just fine. Dropped it off at the bodyshop and they call me and tell me the driver side rear wheel sits a little more forward than the other side. They told me the spring was flipped and installed wrong. Is this possible? I called the shop that installed it and they said it wouldnt be possible to install backwards because of the size of the bolts. They said the front and rear of the spring use a different sized bolt. Any help would be greatly appreciated.