Hardwired Ring Doorbell (2020) Charge

Up until two days ago, I was mounting my Ring Doorbell (2020) on battery power. I have just hardwired the device, and I know its supposed to charge at a trickle of approx. 10% a day. However, when I initially wired the doorbell, it was at 67%...rising to 70% that evening. Then, the next morning the app was showing 100%. I fine-tuned my wiring connections at the box yesterday (one day after the above) and it went back temporarily to battery power, showing 75% as soon as it went back to battery. However, upon reconnection to the doorbell wires, the app once again displayed 100%. Is this a normal thing to see with the app, or is something wrong here? I just want to make sure my wiring isn't causing a surge of some sort.