Hot Neu. / Reverse when on inverter power

[TimeOutside]

I have a small camper. When connected to shore power my receptacle tester shows "Correct" (two orange lights). However, when running on my solar generator's (a Jackery Explorer 1000 v2) inverter it shows as "Hot Neu. / Reverse". Is this expected or is there something amiss? If something is amiss then what needs to be done to correct it? (Note: AC appliances seem to be operating without issue when on inverter power.)

Thanks,
Andrew