What are you misting? The plant and/or media?
What do your roots look like? Withering leaves is usually a sign of lack of moisture and/or humidity.
What kind of sun are they getting?
Joann
Mistking
Looking for a misting system? Look no further. Automated misting systems from MistKing are used by multitude of plant enthusiasts and are perfect for Orchids. Systems feature run dry pumps, ZipDrip valve, adjustable black nozzles, per second control! Automatically mist one growing shelf or a greenhouse full of Orchids.