God, the emotion system is..... it's such a .... a debacle.
I tried that video making thing with a Sim once...same kind of thing happened. The moods are way too unstable to seriously accomplish anything the way the game is set up to. I don't even put the effort in, honestly. Any time I've made an attempt at a specific emotion, it always ends up changed by some random object, conversation, decoration, circumstance, etc. I try to mostly play my game around it. There isn't any Fear, Worry, or Despair anyway so why put myself through the struggle?