Possible oops on the Dendrobium spectabile repotting

We repotted this spectabile back into the same pot because we were worried that it was staying too wet because the mix was old or had too much moss in it. We had two little new growths just starting, and because the plant is so big we managed to bust off both of them. That was really upsetting. We also cut off the oldest few back bulbs and potted them separately to see if they grow. Now the leaves on all the oldest pseudobulbs are turning yellow and falling off. I am hoping this is just repotting stress, but I am freaking out a little that we f-ed it up. I really hope it doesn't keep spreading. We had to manhandle it quite a bit to get all the nasty old moss out of the root ball. I think it might have been happier if we had just left it alone.