Hi neighbors! This should not be happening, as your motion detection is designed to catch things within your motion zones and range. Many neighbors have reported missing a motion and finding that a recent motion occurred just before the missed motion. If you have motions around the time of a postal delivery, but not during, please check your Motion Frequency option in the Ring app. Check out our help center article for more information on motion frequency if you have a battery powered device.
Adjusting motion settings for optimal detection is always the best first step. You can reference our Guide to Optimizing Motion Detection on your Doorbell, which will cover all of the basic settings to review. Another variable to consider is wifi connection efficient. If there is wifi interference delaying connection, then the reaction or communication of motion can too vary in results. Check out our Community post about RSSI for tips on optimizing this signal strength.
If you have another Ring device on your property, check to see if this detects motion during deliveries as intended, for comparison with your Doorbell. If this concern persists, please follow up with our support team at one of the numbers available here. If you are outside of the US, please visit here to see how to contact support. 