It seems like it only writes well when you apply pressure so I think you can try to spread the tines. Just grab the shoulder and pull gently. It's actually pretty common for Bock/Jowo/Schmidt nibs. Also Pilot nibs from oversea retailers. These days I almost feel like adjusting the flow is a must-have skill for FP users.
will give it a try, thanks
you're right about needing to have some nib adjusting knowledge...
PS, I have just tried, it has improved!
I may need to insist a bit more.
Thanks, I was not sure this might be the issue, I had never seen this strange behavior before (only on the upstroke)
Edited by sansenri, 21 March 2019 - 21:28.