All your plants look very healthy. You seem to be doing an excellent job of caring for them. A sudden change in evironmental conditions can lead to bud drop on some plants. Therefor it's a good idea to keep them where they've been growing and do everything the same until they start to bloom. Then you can move them to a better spot for display. Good job.
In my opinion, your Cymbidium (first photo) is blooming under severe stress, (slightly shriveled bulbs, no new growth apparent, only two bulbs) which will cause many orchids to bloom for survival. For the sake of the plant, once the small spike opens do not let it stay on the plant more than two weeks. Cut it, repot the plant properly and get it into growth mode ASAP!