I have had the issue where they teleport somewhere else as well. I think this is due to a unsupported object. Like the booths in Dine Out. What animation package are you using and is the game up to date and are you using the latest Wicked Whims? You may be using an object from a DLC?
Yes, im using the latest WickedWhims, and my game is up to date,since i bought it,along with every dlc/addon pack so far. I use the 4-5 major animation packs, every other works fine,the issue only happens with sitting animations, like on toilet,chairs. Its working fine on tables tough, floor aswell. Didnt tried every furniture options yes, but so far only had issues with the one person capacity furnitures so far, like a chair. Yes its sounds about right,little derpy, but i hope you get my point.
So you have the City Life (or whatever it's called, really, can't be bothered to look it up right now) expansion? I noticed the very same issue after installing that pack. I suspect it is because the new neighborhood has different terrain levels. My Sims ended up teleporting to a different location after I tried to woohoo on one of the bubble blower chairs on the city map. Does the jump always appear when you use chair animations or could your issue be tied to the city map, too?
Its happens on the pre-expansion areas aswell, heck even on the default map/city which came with the vanilla game. And yes,its always happens,i never saw wohoo on any chair due they got ported out to nowhere,and if i cancel the animation they reappear in the streets naked,then go back to normal,dressing up and get back to the house. Kinda annoying, but hopefully it will be fixed somehow.