When Queen Malfafa poops, and the player collects the manure, Queen Malfafa runs at the character continually, pushing the character along. This could be related to behavior of town pigs giving Oincs when the player collects their poop, except the Queen doesn't seem to have anything to do when the player is reached, so is kept running. Leaving and returning to the Palace room resolves this.
I'm sure there would be some town pig who would pay for the Queen's poo... 
Steps to Reproduce
Hang around the queen for too long, wait for poop, collect manure.
Hang around the queen for too long, wait for poop, collect manure.
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A developer has marked this issue as fixed. This means that the issue has been addressed in the current development build and will likely be in the next update.