Description of the Problem:
The Resource Importer is trying to import items, which are not part of their ressource network. After my personell experience it happens on larger factories. The wrong/bugged items in the quere will not spawn.
Savegame:
mediafire.com/file/rch7oi1gqsd14uh/bug.rar
In this example screenshot the bug occurs on the both left resource importers. They should only import steel and rubber.