I have repaired several pedestals that had a single phase connected to both legs on the outlet. Iíve also experienced this myself at several parks.
If you check both legs separately, they will both indicate 120v, but that does not indicate itís wired properly. To check for proper 240v, check both legs together.
John & Clare Lyon
2007 43.5' Monaco Dynasty Palace III (All Electric)
Towd: 2011 Chevy Equinox