My sim daughter has a romantic interest in her mother and father!?

This is some type of bug but I'm not sure if it's a game bug or a CC bug. I only saw it once in my game.
This isn't SUPPOSED to happen - but I vaguely remember seeing the romantic interest bar between a child and parent and being a little confused/annoyed.

And there isn't any story progression in TS4. (don't even get me started.) But if Autonomy is turned on, Sims will go and be out and about and have random coversations with people and if a random romantic interaction happens and they continue with it, they can eventually develop a romantic interest on their own.