Pooping would be my guess. Sometimes they just expel all their water too, if they've had a recent heavy feeding, for example, or are acclimating to new conditions, and so on. If it's just occasional it's not really anything to fret over. (Although if it's frequent like daily, it's not a good sign, but if it's just once, then it's probably nothing.)
Also if after spawning they can be deflated for days. But trust me, you'll know if they spawn on you.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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