I am quite sure. MobileDetect 2.2 (fc3a66e) 18:49, 11. Feb. 2024, MobileFrontend 2.4.0 (7dc20b0) 07:36, 4. Mär 2024, MinervaNeue – (d515f6a) 08:24, 29. Apr. 2024
These are the versions I get when using ExtensionDistributor and SkinDistributor using target "1.39"
In the desktop browser, skin MinervaNeue has got the look. After login, of course. On my mobile, the skin is s.th. like vector, whether I am logged in or not. This means even when I select MinervaNeue in my user preferences!
Certainly the problem is sitting here in front of my screen, but I've got no more ideas where to look.