I have one quiz question on the character 凸 to give its onyomi とつ that refuses to go away. Every time I answer it, the quiz comes back with one question left, and it's the same question. Done it for two days now. It doesn't give me extra mastery or anything if I answer it again, it just doesn't go away. Lmk what info you might need to debug
Just a hunch, but could you post a screenshot showing what the character looks like in the dictionary to you? I want to see which readings are enabled for studying.
You're on an older account. Please refer to the below email I'm copying/pasting in:
It looks like your account is still on the old, legacy setting
for "kanji reading filter" under Kanji in settings. This system is
no longer being maintained, and while I cannot say exactly what
changed to cause this to come up, I am fairly confident that it is
tied to something with this system.
Specifically, it seems in most cases, that the user (like
yourself) has it set to hide kanji rare readings. At the same
time, on most of the "ghost" kanji, you do have some of those rare
kanji readings set as known.
The newer system does a MUCH better job of handling cases like
this. For you (and most people), if you're willing to give the new
system a try, I'd recommend "no extra readings" as the option to
choose.