frame image transmitted is upside down in android

 My client sent this picture. the picture is showing that objects are upside down. He is using Nexus 5X and android 7.0 (Nuget) OS. i just locked OpenCV Activity orientation to landscape. It is my manifest ... I have tested it on my testing devices and a lot of emulators with cam. Galaxy Note 2, Galaxy 3, LG G3, AVD API 24, AVD API 23, AVD etcs.. All of those devices showed me working correctly except my client owns. I can not be able to debug the phone. Because, My client lived far away. Does anyone have any idea? Please, give me piece of advice to resolve it.