Not sure if something has gone wrong, but today, "do you know these sportsmen" was marked wrong. Suggested answer from course was: "Do you know these sportsman?"
Clearly, something has gone wrong. Please report it https://support.duolingo.com/hc/en-us/articles/204728264-How-do-I-report-a-bug
Ok, I've edited it. I can get to the incubator here so also edited "relevant/relative" but can't see the other areas.