Heyy is this a bug ?

Hi so i am using the Chase Colburn Kanji app (really good) and i just encountered what i think is a bug with the 〇 kanji have a look

How the heck am i supposed to guess what kanji it is if i get neither the writing or the translation or anything like ??

I have used the app for months and have ́ever encountered such thing, idk what to do with the information (haven’t found a bug report feature on the app)