I have had a my PU L1 done for a while. 100% completed.
So I logged on this morning to view what had been graded, I had 100% completed on PU L2. Great. No certificate, but I thought it would show up a tad later.
About 30 minutes later, I go and check and my PU L1 said 88% completed, and my L2 had 38% completed. A bunch of things were unchecked, including all of the graded assignments. Iclicked on each link, including assignments and it all went back to complete.
Might be worth looking into.