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What else do you have on? Turn the water heater to LP mode and the fridge to LP mode and no other AC uses on. Don't turn them both on as the same time. Start one on "Hi Fan" and then turn to "Hi Cool" after a few minutes. Then do the second unit the same way after about 5 minutes. Let me know what happens.
If you can't run them both on 50 amps then something is wrong. Do both of them work fine alone?
What is the watt output of the generator? Same problem on the shore cord?
That should be no problem. Some diagnosis needs to be done with an amp draw on the A/C units and a load test on the generator. It may be just a faulty breaker, but testing is the only way to really tell. It might be in the thermostat, but that would be a power issue on the DC side or perhaps some feedback from fluorescent lighting or some other feedback from the inverter.
Any chance they wired up both of these on the same side of the load center?
That would cause this...........
You would be looking for two 20 amp breakers on the same side of the load center instead of having one on each leg. I have a feeling that is what happened here.
Just checking back in to see if that was the problem?