Weird idle animation when walking through doors.

Hi.

I'm not sure if this a bug or mod related and no one has mentioned this in Answers HQ so I thought I'd ask here first.

Every time my sim goes through the door to another room or outside, they do a weird idle. They stop walking and just look up and smile and laugh weirdly and then continue moving. I tried to find the mod with 50/50 method to no avail.

Does anyone have this and if this is mod related what mod causes this? Thanks for help.