I have a similar problem. I installed the script today and it worked fine for a session, but after coming back after a few hours the setting gear was gone and the buttons aren’t displayed correctly anymore.
I can still enable lightning mode and use the buttons through the hotkeys, but I can’t access the settings.
This error occured after I installed this script: [Userscript] WaniKani Hide Buttons in Review
I already tried to deinstall all scripts and I reinstalled the Open Framework script and the Double checker script and it still doesn’t work. I even reinstalled Tampermonkey but that didn’t solve the problem either.
I am at my wits end…