Just tried and it does work for me...weird. Btw, if I try to write on the emulator and export that to PDF (from the Emulator on my PC), then I see your issue. It seems to be related to a "double" not being properly handled, but it seems fine on my tablet. May I know exactly which version of Xournal are you using and which reader to read the PDF on the PC? From the screenshots you seem to be using latest of Xournal, so that is fine as I have the same. Did this issue occurred before as well? Or with latest only?