Difficult to see from that screenshot. From the icon sizes it looks like a 4k display might just be a graphic card issue.
Those 'ghost' circles are on the layer you are moving ? Are they there when you toggle the bottom (background) visibility off.
You are not showing the tool options but not much in the move tool options except a move the active layer toggle.
How did you make a circle in the first place ?
Edit: This a quick animation of moving 3 circles. How do you differ from the basics. (do not worry about the Gimp interface, it is that way so you can see what is going on)
https://i.imgur.com/ieuO9kw.mp4
Those 'ghost' circles are on the layer you are moving ? Are they there when you toggle the bottom (background) visibility off.
You are not showing the tool options but not much in the move tool options except a move the active layer toggle.
How did you make a circle in the first place ?
Edit: This a quick animation of moving 3 circles. How do you differ from the basics. (do not worry about the Gimp interface, it is that way so you can see what is going on)
https://i.imgur.com/ieuO9kw.mp4