Line connection between blocks

I am trying to draw a PID using blocks; when I save the file and reopen always I find that some lines are zig-zag. Sometimes I redraw and it goes ok. I did not understand what should I have to do to avoid this behaviour.
Best Regards

Hello,

See Connections lines graphical bug in Xcos (#17373) · Issues · scilab / scilab · GitLab

S.

I see it, do you have any suggestion on how to draw lines, I need to draw a line out of a module which goes in three sum module.
It does not allow me .
Best Regards