since last update, my sensor form Netamo now have duplicated names:
ex:
sensor.netatmo_janela_do_quarto_battery_2
sensor.netatmo_janela_do_quarto_battery_3
sensor.netatmo_janela_do_quarto_humidity_2
sensor.netatmo_janela_do_quarto_humidity_3
I found the same thing. Try upgrading to 0.63.2 and then deleting all the sensor.netatmo entries in the entity_registry yaml. When I did this, it did get rid of the 3rd entry but the second is still replicating for some reason. I believe there was a partial fix in 0.63.1 to do with the new entity_registry feature.