Pieces created in extension overiding base game pieces

I’m working on my first design, adding an extension to a module, and all was progressing nicely but now I see when I have the extension activated only the pieces I intended for the extension show up in the base game rather than the original pieces. The extension has a different map and when the extension is activated one chooses between the original map (which I renamed) and the extension map at startup. I was able to differentiate the cards between the two maps. I can’t figure out how to make only the original game pieces show up when one chooses the original map however.