The overall rating reflects the current state of the app. It accounts for all app reviews but prioritizes the most recent ones.
Orders are not marked as fulfilled in Shopify when vendor clicks "Mark as shipped"... seems pointless considering its the only thing the app is suppose to do
Sorry to hear that the app is not doing what you're expecting. Feel free to send us an email (info at schof.co) with an order number, and we're happy to see what's going on there!