Sometimes it is simply not possible to drag a manually added faces circle and adjust the circle around the face. It may appear to be stuck in the center. And if you try to add an additional circle, you will create a stack of circles on top of each other. When this happens, click somewhere outside the circle into the image background. This will move the focus from the Info panel back to the image. Now you can move the circle. Then enter a name. Does this work for you?
It is not possible to move or remove the automatically detected faces circles at all, only the additional faces circles you added manually. The circles you can move will be marked with an "x".
Also, I would wait a few days before starting to name the faces on newly imported photos. Give Photos time to scan the new photos for faces. This might save you some work. To see, which photos have already been scanned for faces, enable the checkmark "Show Faces Names" in the "View" menu. The you will be seeing circles around all detected faces.