Lvl 4 kanji 平, using Chrome on Android device with SwiftKey jp keyboard.
It happened to me twice already, maybe more, since I may not have noticed it thinking I’m typing an incorrect answer.
Every time I type へい (didn’t try the others), for the first time it marks the reading as incorrect, when I have to type it second time, it magically accepts, even though the answer I type is exactly the same.
Is it something from my side? The IME that I use? I hadn’t got any problem with any other kanji or vocabulary… this one seems not to like hay