Taking Two Rules of the Road tests

I received my Approval to Test for Inland Master Any Gross Tons recently, It lists both Q100 Rules of the Road:Inland and International as well as Q300 Rules of the Road: Inland. It seems like it should be one or the other, not both but the new Deck Exam Guide does not provide the concrete answer I need.

I called NMC and asked, It was a mistake.