Have you changed brand names on any of the ingredients? If not, my bet is that the manufacturer of one of your ingredients has been tinkering with the formula - of course without benefit of informing its consumers!
If you're still using the same brand(s) you began with, try changing brands. Boy, this is DISTINCTLY WEIRD. Keep experimenting, and let us know what happens - you might be the salvation of somebody else's pecan pie!!;)