I ordered this bed and selected Queen size, thinking all Queen-size beds should be standardized in dimensions in the US. However, this bed's length came to my surprise: after assembling it and putting the queen-size mattress on, the bed frame is longer than the US standard queen-size mattress because the length is 83.85 inches instead of the standard 80 inches. My bed sticks out and looks ridiculous as you can see in the attached photo! 
I looked back at the box for the measurements and realized I should have checked the detailed dimensions before ordering, not only based on the listed sizes for customers to select (twin, full, queen, king.)  I can't do anything about it but still, it's misleading to not alert customers about this strange, so-called 'QUEEN SIZE'. Most people in the US will only select a desired size from the standard sizes listed (twin, full, queen, king), unless someone specifically looks for a longer bed.