2 maps showing content?
Okay, google teaches me that "map" in Dutch translates "folder" in English, which now makes sense. (English "map" translates "kaart")
There can be more than one "content" folder. Now when the complete program is in only one place, either the internal memory or the external (SD) then that is the place where the complete "content" folder ( that one includes voices, languages, maps, ...) should be. It's possible to split up the program and the full "content" folder, it's possible too to split up the "content" folder only, although in either scenario you should know what you are doing and make the necessary changes in sys.txt.