"I wouldn't be surprised if everyone on that cover is traced, and he forgot that part of Spider-woman's torso should be behind Daken."
That's my assumption. They had this exact photoshop fail with Julian on the X-Men 500 cover redo when all of the characters had to be rearranged. Someone forgot to hide the lower half of Julian's torso behind something so he was pretty much floating in mid hair with a triangular waist much like Spiderwoman.