Problem with being able to see the person with the background still lit up and good – Green Screen by Do Ink Review

I like this app sometimes because sometimes everything is awesome and other times the app is weird and the picture will be fine but the back ground is to dark and will turn into the green screen and when I try to fix it then the person is see through and that won’t work that well on making it look real. Pls respond as fast as possible on a fix or if I’m doing something wrong.
Review by Tristen12x on Green Screen by Do Ink.