"iPhone Settings not opening, displaying Home Screen instead: When I click on the settings icon I dont get the usual list of settings. I get instead a copy of the screen that shows when I open the phone."
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iPhone App Opening Incorrectly:
A. Clear the Caches:
System Data is created to permit application to open easier and quicker, as they are used. So, see about clearing them. Use my User Tip: How to Clear "System Data" in your iPhone's Storage: - User Tip
B. Provide Two Screenshots:
Reply with of during and after screenshots of what is seen when tapping the Settings icon. Go here: Take a Screenshot on your iPhone - Apple Support. IMPORTANT: Block-out personal informatio (i.e. names and time) by covering it with red-colored rectangles and such, through use of the Photos app.