Hi Scott,
I just checked the one-page lister by toggling one of my auctions I'm preping to Fixed Price, and the switch for Accept best offers appeared and toggling that also brought-up the Auto decline limit.
Got a suggestion.....
I've seen situations where an update (by Auctiva) to the one-page lister has odd field problems. When that happens, running the ERROR CHECK sometimes corrects the problem (update page to correct for new format/changes). Try that and see if it corrects the fields (or helps).
Danno