Do you think that a word should be automatically marked wrong if someone views the detailed word information viewer (the "i" or magnifying glass in the corner on iOS and web versions, respectively) before they've written the word in question? This might make sense, considering that the characters are already revealed to the user at this point. They would, of course, still be able to toggle it back to correct afterward if they wanted to. It might be the case that most users who do this already know the characters, and just want to check out more detailed info before moving on, so we only want to implement auto-incorrect if people are mostly using this method to cheat!