Think I'm with push it, seeds will be from pollen, you said hermies late then little time for seed to make. Pollen can travel from next door or down the block. You can even carry it in yourself from somewhere, and it sounds like you spend some time there. Might help to know where in the bud the seed is. Fix the stress and the strain, your strain must not like your style.

Light cycle is really important, do all go off on schedule, is it really dark(sit from 15 min, can you see anything), then do they all come on time.

If you want to be mother nature, it's allot of work.