Now I’m not saying there is a bug, but I am 99% sure I typed “to take back” as the meaning of 取り戻す and it was marked as incorrect during my lessons. 
Experienced it twice, though the second one was a reading where I might have made a typo.
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Neither?
The other day, I had wanikani repeatedly reject a specific answer. I was ready to file it as a bug, until I looked more closely and saw that the kanji was a different, but extremely similar looking character to the one I expected.
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Oh yeah, I’ve had that too, but this one was in my lesson batch of 5 completely different items, so there was not much I could’ve confused it with.
I was sure that I entered the reading correctly - but WK showed that apparently I entered こうきょう instead of こうぎょう (which I truly thought I had entered, and had even correctly sounded it out in my head) - the ‘k’ key on the keyboard is pretty distinct from the ‘g’ key, but maybe it was somehow a typing error on my part.
Oh well…
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Are you using a QWERTY (or other layout) physical keyboard on a computer and entering as romaji?
Depending on the context, you could actually be having a hardware or software input issue, completely unrelated to you or WaniKani making any mistakes. It’s definitely happened to me. 
Yes - I’ve wondered about that, but sometimes when you’re running on ‘autopilot’ and something unexpected occurs, it’s hard to know for certain whether it was something that you did (by absent-mindedly pressing the wrong key) or something that the system did to you…
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I’ve had this before, it gaslights you into thinking you made a mistake to the point I physically reeled forward in my chair at getting something wrong I knew I wasn’t, haven’t had this in a while but I just re-do the answer with the exact same thing and it accepts it. Happens very rarely.
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