shouldn’t 1080p and 4k have no difference if my monitor is only capable of displaying 1080p
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Turning 4k video into 1080p video means doing some math to figure out what color goes in each pixel. Not everyone does that math exactly the same way, so different conversions of 4k into 1080p will have different colors in some of the pixels. Apparently you like the conversion your graphics card does more than the one the video creator did.
If you’ve ever heard of multisample anti-aliasing (MSAA), that’s telling your graphics card to render some features of a game in a higher resolution and downscale it, so it can make more informed decisions about which color should go in each pixel. That’s more or less the same principle as is happening here. Your graphics card makes very good decisions about how to downscale high-resolution video into low-resolution video.
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