This is likely caused by side loading OP7 live wallpaper into an OP6/6t.
That is an OP7 camera app that you have "side loaded". It will not work properly in an OP6T...
Ok, look at my previously posted suggestions:
No screen recorder. = uninstall screen recorder, if you installed one.
No screen overlay. =...
First, you need a subject to focus on. Portrait mode will blur the background for an artistic effect.
From page 18 of the manual:
Long press the camera app.
Tap App Info.
Tap clear storage then tap clear cache.
Then restart the phone.