I am not sure I can help I have just had the same thing happen to a mini catt of mine, I had it upstairs and all I can put it down to is drop in temps up there as we have no heating up there and I hadn't noticed it was budding ( dont ask me how I missed it as they were well developed) so hadn't moved it down stairs where it was warmer, often when you buy a orchid in bud they blast just due to changes in the environment from where they were purchased, I dont have that excuse, I can only presume mine was too cold at night.