The screenshots found in an owned game's Overview do not maintain their aspect ratios relative to the application's window size (technically, it's relative to the frame they are in, but changing the frame size requires resizing Galaxy's window). If the width of the window is around 1430, then the screenshot will appear normal, but as the window is resized, the image becomes cropped. Resizing the window's height makes no difference.

See attachments for examples (1168, 1437, and 1920 width size).