Strange numbers wile "loading" FP3

Had no chance to load this morning, then got stuck without any access to elictricity and the phone said, it was around 11% battery. Accepted a call, some minutes, didn’t look at the charge.

Coming home, it was off.
Put it to a charger and after some 15 minutes, I switched it on.
68% battery!
I wondered.
Then the battery status was falling, while it was connected all the time.
It is now on 30%.

Is there any explanation?

edit: This morning it still hang at the charger and the battery state read 27%.
Maybe the charger is defect?
Meanwhile I bought a new charger and USB cable, now it is on 77% and counting.

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