Mobile build result is wrong

hi. i build for android apk. but this strange wall block my camera(or UI)
my project base is city park. it free in market.
and i did’t edit ui or camera. just using third-person character.

  1. i tried change player pawn but same situation
  2. i tried change normal camera to cine camera, in pawn editor. but not work.
  3. make other camera setting in map. and change player control to that camera. but not work.

and this strange wall is little see-through. third person body’s light reflection can see. when using joystick.

i really need your help.
i wait your solution. sir.