If you typed "you're" and it was marked wrong, report it. "You're" and "You are" have the same meaning in English. But if you accidentally typed "your" or "you'r" then that is an error.
If you typed "you're" and it was marked wrong, report it. "You're" and "You are" have the same meaning in English. But if you accidentally typed "your" or "you'r" then that is an error.
Same word with and without diacritics, basically, which are always optional. Adding ٌ to the end though shows specifically that the word is indefinite and in the nominative case.