Auto female Jack Herer made seeds

So I had 8 Auto Fem Jack Herer growing next to Bruce Banner photo period. 4 of my BB turned out to be males and I chopped them as soon as I saw they were males. All of my JH made seeds. I still have 6 weeks to go for my BB. The BB males showed up several weeks before the rest of the BB showed their female parts. The JH was about 4 weeks old. Didn’t harvest till 11 weeks. So, does this happen often? How much % loss of THC should I calculate?