OF1LIA

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.