Grandma collects bibles? Me too!
It's not so uncommon for lily color to drastically fade to white as flowers age, and there are a few that actually change their hue as they age, too.
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Lorn, it was fortuitous that you had forced that one pot, and noted different results. At least you know there are two (or more) causes: one (or more) happening by mid winter when you brought the pot in for forcing - causing abnormal petals, and one (or more) after that - affecting reproductive organs.
I've read a paper or two that explained how waterlogged soils can cause certain nutrient deficiencies. If I remember correctly (really not sure) I think it was manganese and/or magnesium, and potassium. That's all I got for ya now, but I'll be thinking more about it....
