Very unfortunate. The only thing I can think of is that they are very (maybe overly) cautious. Keep in mind that when people adopt from rescues, they expect almost perfection (especially medically). There have been people that have sued rescues which now in turn makes rescues very cautious, especially if they are adopting from a distance.
Personally, I would back out of this. Go to a local rescue or shelter. This way you will be located closely should anything go wrong.