No Inverter charge with shore but OK with genset

[dentmac]

With the genset off and post plugged in, I have 2 phase 120 V displayed on the gauges above door, Inverters are on with 120V coming through as everything runs and 120 V lights work (Bath rooms and galley table). But the Inverters do not charge. So I have power from post.. but no charge.
With genset... all normal.. chargers work.
What is different between 120 V post supply to Inverters and 120V gen supply to inverters? Post supply gives no charge.

I have reset inverters, cut all power/ shutoffs and rebooted..

Help appreciated