Challenges are not being showed as completed

I am currently on “Learn CSS Colors by Building a Set of Colored Markers” and I noticed that some of the challenges I completer are not being marked blue as completed. I am have done the first 13 challenges but challenge 1, 2, 5, 9, 10, and 11 are not being marked as completed. I went back and did them again and submitted my answer and it states I passed but it just not being mark completed.


We have been having issues with the stability of the backend. We are working on resolving them see:

We request you try again in a while.
Thanks for your patience.

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