The answer is that Apple have poor UI in App Store Connect.
By default, the App Store previews shown on the main screen when you update an app only show 6.5", 5.5" and 12.9" displays which is what most people update.
When you click on 'View app Sizes in Media manager' you'll discover that the 5.8" screen size, likely hasn't been updated - which is probably what you are seeing on the App Store (for many users).
Just make sure you check and update all the common screen sizes next time you do an update and the problem will like go away..
good luck!
mcody
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