Warped boot sole?

Just got a pair of Alpina SSK skate boots to replace my old and worn Rossi X6. Generally liked the boot but noticed it didn't want to stay close to the binding. I put the boot into the binding without wearing it to see what's what. With the roller ski just sitting there (I wasn't even testing for wheel hang at that point), the heel of the boot stayed up about a quarter of an inch from the binding. This was puzzling because my old pair of Rossis always made perfect contact with the heel plate. Also, I noticed that Alpina's heel was uneven - kind of tapering off towards the back of the boot, so the two back "teeth" of the heel would never touch the binding even under my weight.

So, I have a suspicion that the sole is somehow warped and I'm puzzled by the shape of the heel. It's also weird that both boots are like that, so it's hard to say for sure it's a defect. Anybody seen anything like that?

Thanks!