OF1LIA

Definitely herming/male flowers. More resilient does not mean bullet proof. All seeds are individual organic beings with unique genetics, nothing is guaranteed 100%. Showing pre-flowers in week 3 is nothing unusual for auto flowers. Feeding every product in the grow shop is not a great idea.

Hermi, pluck em and hope they don't regrow but they likely will. Might be easier to start over if you don't want to be checking all the time. as one missed sacked = pollinated tent. Likely outside of your control and predetermined from the get go with the seeds. Some PGR's will cause this. Some companies like to hide PGR's in their products, but that might not be the case still. I've yet to experience this, but buddies who have say end of flower sacks can sometimes be normal on some strains and plucking them off is fine, but a plant making sacks beginning of flower will not stop and it will be a wasted effort. Good Luck!

All a F1 hybrid really means is it's the first generation of a cross of two different strains. This means they'll display "hybrid vigor" that can potentially make the cross better than either parent but it also means it hasn't been stabilized yet, which generally requires either backcrossing with one of the parents or crossing with itself. Unstabilized genetics can be very unpredictable and hold a lot of variance. F1s are good for pheno hunting but you gotta be ready for results like this too.