User:Korenki7

Vector for desktop and Monobook for mobile?
Before the "Timeless" skin came along, some wiki masters have opted to serve the Monobook skin to their mobile traffic, due to its superior implementation of responsive design compared to Vector. I saw such a wiki in early 2021 (obviously with a much earlier MediaWiki version) but forgot its name, but I can remember that it had a green logo and likely green as accent colour.

It appears that the wiki operators who choose this configuration wanted to ensure that desktop users served the mobile version for whichever reason receive a page that is "desktop-first", which Monobook is but Minerva not.

Just my two cents.