Q: camera roll show two same photos each time I take/download a photo/picture

Hello there endeavor1886,

It sounds like your photos app is visually duplicating your photos but there is really only one in the app. I would quit the Photos app first:

Force an app to close in iOS

1. Press the Home button two times quickly. You'll see small previews of your recently used apps.
2. Swipe left to find the app you want to close.
3. Swipe up on the app's preview to close it.

When you have done that restart the device and test the issue again:

iOS: Turning off and on (restarting) and resetting
 
If the issue persists, backup your device to iTunes, then restore it as new and verify that it works. 
 
How to erase your iOS device and then set it up as a new device or restore it from backup

If it does, then restore your backup to either verify it still works and the software just needed reinstalled, or isolate the issue to the backup file itself. Thank you for using Apple Support Communities.

You are very much welcome! Sorry that it came down to having to restore the phone but at least it's all sorted now.