How Was My Hoya manipurensis Pollinated??

Your guess is as good as mine as to how my tiny Hoya manipurensis was pollinated.  I have had flowers on this species, which I still think is a Dischidia, many times before without ever achieving pollination.  Hundreds of people have flowered it, and yet I have not heard of anyone else having seedpods develop. It doesn’t make a lot of sense as there doesn’t even seem to be any fungus gnats in this tent. The only living things other than plant life in the tent are almost microscopic soil mites that do no harm.