The doorbell isn’t against a wall or frame so button on the side is safe. I’m using a ring plug-in transformer as I don’t have an existing doorbell system. I have tried it again today and its still doing the same.
One thing I have noticed, is that the instructions state to change the power setting to “none” as it’s not on an existing doorbell system. But the options for power are not showing anywhere in the app, and does not give an option during the setup to select which power type is in use.