This is one of the circles. If you look on the sides some space is between the shells and fill. The nut doesn’t screw on to this because it isnt round
Generally, things like this are caused by loose belts. How was the object oriented on the print bed? (as in: were the gaps directly in line with either the direction of X or Y motion while it was printing)
If the gaps lined up with an axis like that, that’ll tell you which set if belts is loose. If it doesn’t line up, tighten both sets a little bit and try again.
I have tightened one belt and i see another that may need tightening… After my current print is done i will try to tighten