Going from broken down sphagnum to dry bark was a shock, to say the least, and you had few roots to support getting moisture to the flowers as well as the leaves. The plant chose the leaves and forfeited the flowers.
You might increase the watering in the bark if it is large to medium and see if this stops the die back of the flowers. Some growers recommend cutting the flower spike when there is a poor root system discovered at repotting so that all the energy will go into growing new roots and leaves.
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