"looking for the kun'yomi reading" pop-up obscures "view the correct reading" button
If you enter the wrong reading for a kanji, the "WaniKani is looking for the kun'yomi reading" pop-up will appear, but not disappear. If you then enter the incorrect answer, the "Need help? View the correct reading and mnemonic" pop-up will appear, but the "looking for the kun'yomi" pop-up prevents you from actually clicking on the correct reading button.

I have this problem as well, but this bug can't be solved by this application. It's a problem with WaniKani itself, as this is the same page you get when you visit WaniKani on the computer.
But it actually works in Chrome, lol. I think there's a fade animation and it doesn't trigger on mobile for some reason...

Yeah, I thought about that being the case at first but browsers seem to work fine. The thing is, we have quite a bit of customization in our browser implementation. Will have to look into it sometime.