What is the result of pressing "Enter" after entering a word in Cloze-Listening?

If I type a word into the box in Cloze-Listening, then press Enter, what is the effect? Is it like choosing “Ignore”? “Today”? “Hard”? “Normal”? “Easy”? The interface doesn’t tell me, and the information displayed for each sentence after the round is insufficient to let me know.

Note also that the label under “Hard” button says “1 days”, which is ungrammatical.