The minimum system support version we set in the .xcodeproj project file is iOS 9.0, and the MinimumOSVersion in the Info.plist file whitch contained in the .ipa archive file, has a value setter to 9.0, but after uploaded to Apple Store Connect via Transporter app, the minimum supported os version become iOS 11
The app's minimum os version changed to iOS 11 after uploaded to Apple Store Connect
We had the same problem. Our App was built on iOS 9.0, but after we uploaded it to App Store Connect, the build was also changed to iOS 11.0. The current suspicion is an Apple bug.
Same issue as this thread: https://developer.apple.com/forums/thread/687778