I'm having a problem with my white eggplants and I can't seem to find any really helpful information. I've been hand-pollinating, and I'm seeing flowers fall off , but it's only the petals and the stamen parts. The stigma is staying on the stem.

All the things I've seen and read about "flower drop", it looks like the entirety of the flower is falling off the plant. I'm really new to this and I'm having trouble telling if my hand-pollination with a paintbrush is working, or if I need to start looking for solutions to this issue.

Thank you in advance,

Emily