They made an error. "hukutusalamia" is correct.
You did not greet us shouldn't be Hukutusalimia?
I've also seen -me-/-ja- referred to as an "immediate past" tense, so it's possible that the tenses don't neatly line up with English simple past/present perfect.
The hint offers both Evening and Night but the answer doesn't accept both
Why is it suddenly salimia instead of salimu?
Instead of jana usiku can usiku uiliopita be used too in this sentence?