@DamonAverette I'm not sure if this is related, but there has been some staircase-related bugs like these, and it might be related. If it's that bug, you can try a couple of things:
1. If you're on an active lot with a household, try to travel.
2. Go into Manage worlds (exit the lot to map screen) and then reload it.
3. Restart the game (like you did, usually fixes a lot of issues.)
4. In Origin (when game is not running,) right click on The Sims and choose "Repair game".
Glad it worked out and hope you have fun gaming!