There are a few places where the hints lie to you 
. I’ve noticed this with some blanks where we are supposed to give the word for a specific relative. Then when we provide the word, the hint asks for a “more formal” word when in fact it is looking for a less formal word. I’ve found this with 祖母 and あに and there may be a few other instances as well.
I just took a look and the hints all appear correctly.
For example if you type おにいさん for the あに vocab cards, it will tell you it is look for something more casual (あに being more casual). The inverse happens for 祖母 where if you type おばあさん it will ask for more formal (祖母 being more formal/polite).
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