Few banana(s) inside the bud near the end of flowering is something pretty common depending strain and/or phenotype.
You don't necessarely need to worry about it as most of the time they won't get mature enough to drop some pollen before you harvest, even tho they drop some pollen the plant won't have enough time to produce mature seeds and trichromes maturation is already advanced enough not to impact significantly your plant potency.
You can also remove them gently with some tweezer before they open up and drop some pollen.
Check my critical from nirvana
growdiaries.com/diaries/27173-critical/week/205870
i had a few banana inside the buds that you can see on the first and second photo that i didn't even care to remove, not a single seeds in the end
Happy growing