Finalize mobile progressive web app

I have developed a mobile progressive web app and need help finalizing to go live. I think I have issues with either my [login to view URL] file or the service worker. App seems to work fine on iPhone, but having issues with Android or Microsoft. iPhone downloads a great app icon and navigates well fullscreen. Android only downloads a "shortcut" icon with that annoying arrow on it, and navigates approx. 80% fullscreen. Microsoft tablet also downloads just a shortcut, navigates somewhat, and will not go fullscreen - shortcut is to browser application. I'm hosting it on HostGator with https. [login to view URL] Thanks.