I hope that's just normal falling. I couldnt find a whole lot of info on what to expect when I got it. Its pretty amazing how fast the flowers open up it must have 20 on there now
Notice the "leaves" come from two location - at the outside of the pseudobulbs and at the top of the pseudobulbs. The first ones to yellow then come of should be the outside ones. If all yellow at the same same, that's wrong.