Do you wear boots often? It could be that your ankles simply aren't used to boots yet. Shell in general is more sturdy than calf, so the break in may be a little more harsh. Also, what kind of soreness is this? like rubbing soreness on the surface of the skin? Or something more internal? Personally, I had no such problems with my shell boots, but I have yet to wear them for more than a few hours at a time.