Pictures are not scaled to the phone screen size

[Sunny Teki]

Hi im using lumia 1520 latest insider build.factory resetted.i have been seeing the low res pictures which are downloaded cannot fit to the screen, while some high res camera pictures and few high res downloads are fitting to the screen. Its been a little discomfort in sliding through my pictures

 

[Jon_Rubinstein]

Same here with a 950XL. IMages are not scaling. Even cropped images using the editor are not scaling to fit the screen.