They do that sometimes. I've left mine on the stalk, misting/giving more humidity until aerial roots started to grow and the stalk started falling over, then pinned it down in a 2nd small pot containing mixture of orchid bark, potting mix and sphagnum moss to root. After it was established and a vigorous new leaf started to grow, I clipped the baby off of the mother plant and trimmed the stalk at the base. I believe the mother plant needed time to recover and may not have bloomed as well that same year, though.
It's a fun way to get additional plants.