You said the outlet tests good.. I assume you measured 120 volts side to center (Top) from eitehr side.. Did you measure Side to Side? (should be 240 volts)
Some parks.. "Cheat" what they do is run just one leg, (Cause that what was there already back when it was a 30 amp site) and feed both legs with that one leg.
Your Intelletec EMS will read that as a 30 amp site.. Every time. In fact if everything inside the RV like Air Conditioners works, and works exactly as though you were on a 30 amps ties. this is the ONLY thing that can cause it other than a failure in the Intelletec EMS (And one such failure is a simple fuse, I think it's a 5 amp but it might be a 1/2 amp. )