Trying to insert 1920px image as background for row but it's not showing!

I don’t know if there’s something completely obvious that I’m missing here but…

I’m working on a laptop with HD screen, and want to add a HD image as background to a full-width column.
However, when I select full size the image is not inserted, and the only way that I can get anything showing is by selecting medium size 1024px which looks very smudged and bad.

I really don’t understand what is going on, how can I make BB behave (logically)?