I think they're just hanging there, maybe dying of old age. Some kinds of plants have sticky buds that insects get stuck to by accident, in which case it's more like the plant is attacking the flies.

now that i think of it, they were kinda difficult to pull off of the buds, i thought they just had some kinda deathlock on the buds. cool! thanks

i went back out and checked it....there was another fly on the bud, and i think it flew away when i got close....

I checked the buds, and they don't feel sticky to me?