When that's happened to mine, it's always been associated with the hair in back. It gets caught and prevents the stool from coming out. I just drop her in the sink and it dissolves quickly in warm water. Then I trim the hair to make sure it doesn't happen again.
Not sure what would cause it if it's not hair, unless there's something foreign in the stool.
Good luck! I know how stinky that can be!
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