Yellow leaf, yellow on stalk of dendrobium?

[butterfly_muse]

Evening, guys!

I just picked up a dendrobium this week and have since moved it over to a light setup with the rest of my guys. The bottom most leaf on the tallest stalk is turning yellow, and it looks like there is something weird going on under the top leaf of the tallest stalk. It looks darker and...weird.

On one of the lower stalks there is a little nub in between the leaves and it was green...now it's yellow. In addition, it looks almost like part of that stalk has shriveled inside of the other and is leaving a gap between the two? It's hard to describe, I hope the picture shows what I mean. The bottom leaf on that stalk also looks like it's beginning to yellow. =\

I know the 'chid is overpotted and I am waiting for it to drop its blooms until I move it to a new media/pot. The boom stalk is starting to turn brown from the top down and dry out, and the flowers are wilting, I guess maybe it's sulking from being in a new environment? I have not watered it because it is potted in moss..so..any idea if this is normal or if something else is going on?

Help! Thanks!