Problem with wallpaper background scaling

[tapioca2]

I just downloaded the Simple TV Launcher. It is great because it is very simple to use. The only issue I am having is the "Set Background Image". Once I select the image, 1920x1080 for example, it is not displaying correctly on my screen. My TV box display mode setting only has 1080p. When I selected it from Gallery it showed properly but on the Launcher, it shows only partial. It seems that it is not scaling according to the screen size.

Someone also commented about the same issue in the Play store.

If you can fix this it would be appreciated. Thank you for your great app.