"Wish for it" but still have to request an ARC

[A]

Recently I had 2 cases (a couple of weeks apart) where I clicked on "wish for it" on NG. A week or so later I was trolling thru NG & clicked on the books again and "wish for it" was replaced with "request"...so the pub. obviously did not know I still wanted an ARC. Color me crazy, but I thought "wish for it" put me in the running for an ARC while ARCs are still available. Why do I have to still stalk a book once I've used "wish for it"? I've missed out on some books not knowing I had to go back and hit "request" if my wish wasn't granted.