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Yeah, you're getting 4K. The 1920x1080 that is "default" is Retina scaled so 1080x2.
I'm not 100% sure how scaled work but note it says "looks like" rather than is which I suspect it's charming a PPI multiplier to simulate the scale of different resolutions while using 4k pixels.
You could try this ap which makes things a bit clearer... http://easyresapp.com
Als oho into "about this Mac" > "Displays" from the Apple menu bar.
chrisbmx116
kboy
"Default for display" just goes to 1920x1080
I think I've managed to make it work with the option key on scaled resolution. But, it does appear to slow everything down quite a lot.