i'd be inclined to think that FF is right with this one. (this is just based on the temp rise pattern of course! our intuition of bodies is always an important factor!). have you tried seeing what O date FF gives you if you select 'research mode'? i remember with my successful cycle that on the automatic one it didnt detect ovulation so i switched to research and whammo, there it was (albeit a couple of days out from when i suspected O). if you want to check it out and compare here it is:

my chart

HTH!