Help needed for a 3D printing issue

[JN84]

Hello, I have spent a lot of time googling looking for an explanation and solution to a problem I have.I use an anycubic chiron printer, but I think I have seen this on other printers to. I use cura for slicing and pretty standard settings printing pla.I am printing a cyclindrical object and it seems that rather than print in continuous circles, (like one long multiple loop) it prints up to a point, then turns around and goes back around the circle all the way until it reaches the same point. At the points it turns around, there is a definite vertical line (as each layer builds, there are features at the point it turns back).On the left hand side of the vertical line, the layers look nicely fused, on the right hand side of this line, the layers are fuzzy and there is too little plastic extruded here.Please advise on what the cause might be, and more importantly a potential fix?Many thanks in advance!