Same results here. 13.6V when on shore power no matter what. At least that doesn't exceed my batteries gassing voltage, so, although 13.2V would be better, I'm not worried about over-heating and drying out the batteries during float.
As for real charging, I've got a separate "intelligent" charger for that.
It's as if the thing doesn't have the charger function at all. It's just a 13.6VDC converter with a battery attached.
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