It seems like at least some preferences for gadgets are stuck 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
Note also the bug T125793.