Help! Sideshot not centered?

20220520_194316.1653090292.jpg
so I think I have figured it out. See how the top of the scope is missing? I have moved the phone up slowly, down slowly. Left slowly, right slowly. It changes the pic quality but the view with the top never changes. I also rotated the mount. that only levels the crosshairs. View doesn't change. But if I grab the phone and torque the top outboard that fixes it. Short of shiming the phone mount where it attaches to the prism body I don't know what to do. Is there an adjustment to the prism?