Herma?

Those are the calyxes from your first preflowers. If you're finding seeds, a pollination took place at some point- likely from a banana. That can happen, part of nature "finding a way" if you know what I mean. True hermies don't push bananas, they make pollin sacs- looks like clusters of little balls that release A LOT more pollin. You can use self pollinated seeds- that's basically how most feminized seeds are made using colloidal silver. Those seeds will carry the same genetics as the parent though, including tendencies to hermie or push bananas.