This does not look like 1080p. This looks like 768p. How’s OS scaling on your end:
There’s also this:
Eye-balling it, your system / browser font seems larger than anything I see on my end. 25% larger roughly.
But yes, things could be tighter. However, the size of your tabs / font…
…is somewhat intimidating. And that’s not even full screen yet. This is 100% zoom in Firefox; checked Chrome and Edge, too. Chrome seems the smallest / most tight to me. Whatever is affecting it affects the rest of rendering in the browser.