Does the EVSE not work on those outlets? Fundamentally, a GFCI is monitoring the difference between current on the hot and the neutral, and doesn't actually require a ground conductor to operate. This is the reason that National Electrical Code allows you to use a GFCI breaker or outlet on old 2 conductor wiring without a ground conductor and then install 3 prong receptacles downstream. That said, I've never seen a GFCI outlet that didn't have a ground terminal on it.