I just checked it. Its because both mods add the same name of the items, but just move it around in the menus and the blueprint lab hides them. When you are inside the lab, the items exist in that case the menus. I would recomend you use https://mods.factorio.com/mod/creative-mod and maybe https://mods.factorio.com/mod/EditorExtensions for access to the same items, that get hidden :) for use on a creative mode. And I think it defeats the pourpose of the this mod is to make the blueprints and paste them on the "real world" with out that items.
In the next version I would work around the names, but it probably will make the same items twice and kind of clutter the menus.
