Sei's Strut

first off, I have decided that Sei (my social anxiety other) and Rina (my PTSD other) are going to be introduced. here's sei's sim...

how and why is she walking like that? I have a mod that shrinks a sim to tiny or blows them up to giant... when they're tiny, their actions are... REALLY funny to say the least. I paused the game when she was going to go for a run while she was REALLY anxious, so I took a screenshot.

what category would this go into??