I think I would try taking off the panty hose and the ties, so you can get a look at the roots. You'll be able to see very clearly how well the roots are attached. If they really are, you'd have to pry them off with your fingernails, they attach very firmly. Here are a couple of mine, firmly attached to cork, and one to a pot:
I use zip ties all the time for extra stability when mounting orchids on cork. They eventually degrade in the sun, but then you probably don't have your Phals in much sun anyway.
That's an absolutely gorgeous show of blooms you've got going there!
