I'm gonna take a shot in the dark here but...have you pulled a bullet from the FTF cartridges and check to see if you have any powder in it? I've seen this before from a reloader that used to pull cases from the tray, charge them and return them to the tray. He lost track of where he was at and skipped an entire row, thus causing the FTF in multiple cartridges.

I have never experienced a bad batch of primers in over 10 years of reloading.