theoretically you should just get 50/50. so either you have a coincdence on your hands, but no male at all from 30 seeds would be pretty unlikely if the ratio really is 50/50.
the femming of fem seed is in the pollen used to make it, you take a female plant (xx sex chrosomes), treat it so it produces male flowers with pollen, use that pollen on another xx plant and none pf the seed will have an y-chromosome. so a female from regular side or from femmed seed are the same (xx), they won't produce different offspring.
since you used a male as father, it should be xy, so half the seeds you made should be xy (always an x from mother, 50% gets the y from father).
but odd things can happen. maybe that 'male' you used was secretly a herm (xx) that just looked really male. or maybe there's something from the mother side supresing male-ness, so that those 50% xy plants in the offspring look like normal xx females.
or maybe there could even be some odd thing like meiotic drive going on, but that's just wild theorising, only certaintity is the observation something odd is going on.
if you still have those same plants (which you probably don't if they were auto), or of you have pollen saved, you could try out if you for example also get a lack of males if you cross that same male plant to a different female (preferably from an unrelated strain). or if you pollinate the mother with a different male.
I've also experienced it once btw, pollination of a plant that looked fully male onto a fully female looking plant resulted in only female plants. repeated the cross with 2 different plants from the same lines and got normal ratios again (in this cross the whole point was getting males, so the all-female batch of seeds was a reject)
