SS
A battery must stand for at least two hours, with no current flow in or out, before a voltage test becomes meaningful.
You're also checking an ECU-controlled "smart" charging system that is confusingly capable of changing it's desired voltage at will.
All the charging voltages that you've seen fall into the acceptable range.
Make sure that the top of the battery is spotlessly clean - you'd be amazed how much current can leak through salty dust.
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