Your leaves don't look very bad at all .. but ..
What is your fertilizing and watering schedule?
and how much do you use when you fertilize and how often?
What kind of light are you providing them?
Are they exposed to any cold drafts
I'm just asking basic question to get idea of how you are caring for them .. it helps in assessing any orchid
I agree that you can have a bit of bud blast due to environmental changes as jr described above
Some chemicals can give off vapors that can diminish an orchid's health ..