"nos" and "nós" sometimes confused by Memrise

Hey, I noticed a little mistake in the course, adding a screenshot of it here:

Memrise was nice about it though, I actually wrote in “nós” and it went amber rather than red, but still, to my understanding “nos” not the correct answer.

Also just had another multiple choice question where i had to pick the translation of “us” between “nos”, “nós” and 2 other options. Picked “nós” and failed the question :frowning: