Weird Vanda Flower Questions

[flippie8]

Hi,
I am an orchid newbie, but have fallen in love with Vandas. I had my first 2 flower spikes (& then flowers on 1 but not the other yet). However the first plant seemed to have 3 flowers & it only opened 2 while the third turned into a black ball.

The second plant looks like it has 5 flowers, but 3 are smaller than 2 (that haven’t opened, but will) and it had a yellow ball kind of like my first one did, but again that ball turned black on my first plant so I’m trying to keep that from happening.

Are the plants supposed to have that ball? If so what is it called? I can’t find any detailed vanda books or really anything online about it. Pictures attached.

The pic with the flower is my first plant and then ones with bulbs ready to open is my second plant.