That's probably Disassembled's artist using the original X-Men Gold style sheet instead of looking at recent issues. Teen Jean Grey had the same problem with inconsistent hairstyles, and so does Unstoppable Wasp (both are supposed to have bobs and bangs, but have been shown with a very visible nape sometimes).
You say every other Syaf design has been dumped? Not true. Rachel's back in the costume he designed for her.