I have the Instagram app on my iPhone that doesn't open. The icon isn't the usual app icon (it crashed at one point). I can press the usual Instagram app icon and delete it. However, it still appears as if I have it installed from the App Store. When I reboot the phone, the icon reappears.
It doesn't appear under Settings app → General → iPhone Storage, so I can't delete it from there.
Besides the only place the usual Instagram app icon appears is under Settings app → General → Background App Refresh.
I've been at it for a while. I've Reset my iPhone, but it didn't resolve the issue. I am using an iPhone SE running iOS 12.2.