Catteleya Hybrid dropping green leaves, is this normal?

[Mira-Claude]

I like to mount my orchids. A lot!
What I do is first choose a mount.
If you want something water retentive (if you have low humidity problem or in case of orchids that needs more water) a tree fern mount or a coconut cover is good.
For less humidity you can simply take a tree branch and boil it for fifteen minutes to sterilize it.
The less humidity retentive material would be the cork mount. It's what I use the most for my cattleyas.
Otherwise, and I have to admit that I don't talk from personal knowledge, but a friend from the orchid society I participate in take terra cotta pots with no holes, he mounts the orchid on the outside of the pot and just fills the pot with water when the level gets low. He says he sprays the orchids once a week in the case of cattleyas and that they are doing amazingly well. I want to try it, but I have never done it.
As for attaching the plant to the mount I simply use whatever fine rope I have that will not degrade nor absorb water. My favorite is the dental floss, but fishing lines, fine metal lines and many more can be used too. You can take the rope off once your orchid will have bounded to her mount.
If you have sphagnum moss it is always good to put a little between the orchid and the mount. If you don't have any it's fine, just remember that a little spray at the root will be more important in order to make sure the plant will no dehydrate.
If you have anymore questions don't hesitate.