Were you still on shore power? I'm guessing yes. In that case, you aren't reading the battery voltage but rather reading the voltage being applied to the battery by the converter/charger.
You need to disconnect the shore power first (or trip the REC/CON circuit breaker).
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2022 Cedar Creek Champagne 38EL - "Big Bertha"
2019 GMC Sierra 3500 Denali HD 6.6L Duramax TD, CC, 4WD, DRW - "Mr. Beefy"
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