I am currently on level 28. I just finished a review of one vocabulary (用意) and unlocked two new kanji lessons for 飴 and 叩. Thinking this was odd, I checked where these were from and found they were all the way from level 18! Furthermore, I found another level 18 kanji, 喉, was still locked.
I have every unlocked radical so far at Guru or higher. Any idea what’s going on here?