I've had this happen once or twice with mine, although it wasn't two different poops in a day, just a random poop that was only the urate. His other poops were healthy and it's never been more than once without the next poop being normal. Freaked me out at first, but from what I could tell with no other signs of anything wrong, likely just means he was well
hydrated and needed to expel some extra moisture between full poops. Mine's also a male, so it is possible that his was a sperm plug or something too.