This really is an interesting situation... I cannot come up with a really good analysis really.
I've seen that situation before, and I can't figure it out either. All I can say is that I've seen it a handful of times and that the price is still on an upward trend, so I don't sweat it...although I definitely don't get it...maybe it's the only one with real and not inflated value?
That's the conclusion I came to. All good IMHO