The Pivot point of every object is glued to the 3d Cursor Sorry for that, but I have to interrupt your hopefully beautiful sunday, before I'm goin crazy.. :D In one of my projects (I'm a newbie) somehow I glued the pivot point of rotation to the 3d curosor (generally). If I select anything in my scene and push R, the center of the rotation is the 3d cursor, no exception. I attache some pictures, where you can see it. I'm sure somewhere somehow I used a shortkey accidentally, but google doesn't help, maybe you will. Extremly hard to work this way. Thank you!
You probably just changed your pivot point to 3D cursor.
It's the second dropdown menu on top of viewport.