My tablet is 2560 x 1600px, but strangely my website registers it as needing the mobile portrait mode when in portrait mode. I’m confused as the webflow editor preview shows tablet mode as counting for screens as small as 768px. My tablet is more than double that width, and it still shows the mobile version of my website. Why is this?
It is most likely a tablet landscape not mobile portrait version (they are pretty similar). The way your tablet handles its resolution varies and for better legibility many tablets make use of a forced narrower pixel width. Same with the phones.