This feature is called Easy Unlock. When connected to the App, you can simply walk up to your AirBolt and press the left button on it. It will then unlock for you. It is designed for simple and quick access.
However, there may be sometimes you don't want this to happen. If so, please follow instructions here to turn on high security mode.
NOTE: If you are entering your backup code on your AirBolt, then note, if you are connected to the phone, it will unlock with a left button press due to the "Easy Unlock" feature. Back up codes are for Phone-less access, so it's design for when you are not connected or don't have your phone on you.