Cannot re-install deleted app because App Store thinks it is still installed
I cannot re-download a deleted app because App Store detects it is still installed. I have restarted my iPhone 7s after deleting the app and before entering the App Store to re-download the app. There is still a white icon of the app, even though I have deleted it and restarted the phone again and again. In App Store there is only "Open" button instead of the "download" button. I have pressed the "Open" button but still cannot open or download the app. Please help me.
iPhone 7 Plus, 14