Occasionally, I will write the reading when it asks for the meaning, and it gets marked wrong. Other times, a finger slip will cause me to accidentally input the wrong hiragana, despite never having written it that way before. This generally happens very rarely, when I’m plowing through 100-200 reviews at a time.
It would be cool if WK had some sort of “reversal” mechanism, whereby innocent mistakes are forgiven, instead of throwing something at master level back to apprentice when you already know it. Or like, the ability to recognize you’ve accidentally typed the romanji version of the English-language meaning.
I do realize this could be abused, but they could limit it to maybe 2 or 3 per day. I feel like I’m losing a day or two every time I make a tupo mistake.