Hello Justinas,
I had these errors before too, I thought they were a result of the gap settings.
I don't think this is about the schema's, I am having the same problems with this drawings in other (standard) workspaces. When I draw new pipes in the old drawings then they behave like they should. My guess is that there is something wrong with the existing (converted from PSPID) pipes. Anyway, I included my schema files so you can take a look at them.
I use the latest version of powerPid.
Kind regards