It seems like at least some preferences for gadgets are stuck/broken and can't be changed at nowiki. At least I can't change a gadget for adding Wikidata-info to the top of the page ("Legg til en lenke til Wikidata under artikkeloverskriften. Viser også evt. beskrivelse lagt inn på Wikidata.") It is turned off and still adds the information to the top of the page. Likewise gadgets for creating searches at "Bokhylla" and "Kulturminnesøk".
I'll do some additional testing.
- There are no console errors, not even with ?debug=1
- Checked Chromium on same user, and the problem persist there too
- Changed from user "jeblad" to "jeblad (bot)", and set the wikidata-gadget, and it does not show up
- Tried to change the skin to Monobook, and it does not change in the browser at all
- Tried to change the skin at nnwiki and it worked as it should
I wonder whether I first encountered the bug Thursday 25th or Friday 26th, I think it was very late 25th.
Note also the bug T125793.