Apologies if this is already an opepn bug, but it's an issue that won't stop happening for me. I've got a kanji helper schedule (Kanji for 初中級の単語) and recently one kanji's onyomi vector kept coming up up for revision even through I answered the question right, then two and now three. Oddly enough eventhough the terms never register as revised the study streak on the schedule is not affected.
Sorry for the delay - catching up after Golden Week over here. Can you check the discussion at the end of this thread, and see if it applies to you? https://app.renshuu.org/forums...
Different user, but I had this same exact problem. Michael's suggestion to switch to the new kanji reading system fixed my issue. Thank you for the help!