When using a controllable item (in my case it was the controllable turret from zombie massacre), you can twist your entire player by placing it on a slanted surface. For example, if you place it on the bumpy beach in the condo and use it, your view may become a bit slanted. But if you place it on a wall and use it, gravity and everything switches for you. You have to respawn to fix this issue.
Slightly slanted view from placing the turret on the beach.
I decide not to bundle this issue with my previous issue (controllable turret is broken) due to it possibly affecting more items, if there are any.
Here’s a video of the issue. If you easily get sick when things are disoriented, I recommend that you don’t watch it.