CKS Challanges - question #1 - check button never finishes

I’m doing the first cks challange (trying it again after not doing it for a while).
When I finish all the questions, I press the check button and the check button flashes forever but I’m not getting the results.
I also tried refreshing the page… the lab restarts (my changes are already there so I just press the check button again, but it acts the same - never returning the results)

Please advise

I just tried it and it completes.
However I think there is another bug in the grader logic that I need to report - marking something incorrect that isn’t