Dendrobium phalaenopisi var. compactum

[DMFLEIG]

This is my second try at orchid growing. i received a Den. phalaenopis var. compactum and all of the blooms turned papery and fell off. Since the humidity was okay( per a bunch of books) and the temp. was good, I am lost as to what happened and what to do now. I also received a oncidium, Sharry Baby. It seems okay but the flowers are now beginning to fall as well. I check the medium with a moisture meter and have not over watered them. I got them from an orchid only greenhouse/nursery and those are the names listed on their tags. Any information would be great. Again, I have very little experience with growing orchids.
Thank you, in advance,

Dee