Yeah, that's how it was with mine as well...none of the other group had it, even though they were together and ate the same food. You'd think they'd all have the same deficiency. But that's just not the case. Apparently wry neck is a case by case deal. Good thing is we now know how to treat...
That's wryneck alright! Had a silkie that did this...lack of Vitamin E, I believe. I bought a bottle of Poly-visol vitamins(liquid form) from wal-mart--you can buy this pretty much anywhere(usually either on the baby section or the medicine section), drop a couple drops in it's mouth each...