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Among others, it could be the result of a 'light' mix or fast drying or too thick of a layer. To be safe, I'd first review your instructions, then ctc. the MFGR. for guidance. It's possible that water/moisture was 'absorbed' by the underlying substrate too, thus causing a light mix. Also, if the room/house is dry, it could have dried too fast. Also, if the room below is REALLY warm, that too, could affect the situation. Get all your 'ducks' lined up and ctc the MFGR.
My best to ya and hope this helps.
Jay J -Moderator
PS: They may advise a light sanding then a 2nd application ...
PPS: God Bless America!