Help with Circle SOP, Problems in Open Arc Type & Copying

Hi all, thanks so much in advance for your help in my first couple days in TD. I am trying to do some basic starter exercises with SOPs and instancing via Music Hackspace tutorial workshops. For some reason I can’t figure out (not that I can really do any meaningful troubleshooting atm :neutral_face:) when I am creating a new circle SOP and change it’s arc type to open that I can’t get a normal lined border, I get this funky dotted circumference and is effected when I try to copy/alter it.

Much appreciated for pointing the way for me to not do this haha.

2020 Macbook Pro
2.3 GHz 1.7
16 GB Memory
Intel Iris Plus graphics
running 10.15.7 & latest version of non-commercial TD