"This student is not like that."
Translation:이 학생은 저렇지 않아요.
Sometimes it's hard to judge distance when it's just on a device so technically 그 and 저 are correct
Did you report it? That's the same thing I put in today (2 weeks after you) ... I'd expect it to have been logged as a correct solution by now.
이/그/저 series are used by the distance from the object to the speaker and the listener.
이 : near to speaker
그 : near to listener
저 : far to both