Confused by LineType Output?

I am trying to use LineTypes to output in Pen mode, but I am getting a funny effect at some (not all) line-junctions and wondering what I can do to fix them? Note that some line junctions look fine, but others have a ‘twist’ (?) to them when I output to PDF?

Can you imagine why this might be happening or how I can fix my geometry to avoid it? I’ve tried exploding and re-joining the curves, but that doesn’t seem to fix it? As far as I can tell its just normal curve, and note that the one right next to it prints out without the ‘twist’ ?

and the linetype is not using a taper or anything like that:

any ideas? File attached for reference.

thanks!
@ed.p.may


Environment

  • Macbook 2021, Apple M1
  • macOS 13.6.6 (Ventura)
  • Rhino Version 8 (8.8.24142.13002, 2024-05-21)

test.pdf (11.7 KB)
example.3dm (3.2 MB)