Hello I have the same problem since I update the Affinity. As you can see I made the same operation and only mirroring the same perfect circle and ellipse. I tried it with converting to curve, and with out, same problem. It is a big issue.
adisee posted a topic in Affinity on Desktop Questions (Mac and Windows)This red contour of the shapes ... I tried to find some topic regarding this situation, but nothing. Could somebody help me with this. Thanks