Bagseed is a crap-shoot. If it's gone hermie this early, I'd get rid of the plant. If you've been as careful as you say, then just replace it with another plant. Watch the plants like you have been, but being bag-seed means they could do *anything*. Some of the seeds may grow out problem-free, while others may be nothing but trouble.

Pity the Bag-Seed, most don't know who their daddy is, or for that matter, if their daddy was a daddy at all.