Sounds like they level-moved something to beyond level 28. You could try logging out and back in to get rid of it in the browser. On Flaming Durtles it’ll likely remain visible until the app synchronizes.
I had it as well today with two different items at different times. I haven’t changed any scripts in ages and it’s the first time I’ve seen it, so I assume something has changed on the wanikani backend and one of the scripts is not handling it well. Disabling scripts allowed me to finish up the review.
It happened again. Just the last item. This time Business. I don’t think it has been altered.
Not made any changes/added new scripts, so must be a change somewhere.
I disabled the scripts to do the last review, worked again.
Same here. Good to know it wasn’t me breaking something haha.
(But just in case, Win10, Firefox 91.0.2, active Tampermonkey scripts: Jitai, Wanikani Double-Check, WaniKani Item Inspector, Wanikani Open Framework, WaniKanki Open Framework Additional Filters, Wanikani Reorder Ulitmate 2, Wanikani Self-Study Quiz, WK lessons cherry-picker)
Same thing with me. I’m using a script and if I have it set to only radicals for example, the last radical I do will remain no matter how many times I go back and do it.
This is the first time this is happening for me.
Hope this can get fixed somehow.