Arabic 1 - Translation Error

I believe Arabic 1 - Lesson 13 contains a mistake:
لأن (li’an) is translated as “because”, but I believe the correct translation of because should be لِأَنَّ (li-anna)
لِأَن means “that” (or “so that”, “in order to”). I notices because I’m learning Arabic from two places, it is also confirmed by: - لأن
Since I am not proficient in Arabic, I do not know if I am correct here.

(As posted as reply beneath “[Course Forum] Arabic 1-7 by Memrise”)