Tino,
my husband and I also had problems with some of the MP nights points not posting. I had to call several times starting in December, and finally three of the four missing flights have been posted. I'll just have to call again for the fourth. I think the HHonors accounting system (e.g., no dates or flight #'s) particularly confusing because the majority of our flights is for the same amount of miles (usually HNL-LAX).
It seems to help if you summarize for the HHonors CS how many flights (by mile number) you took on each route since the inception of the promotion (e.g., 2566x6, 2398x4, etc.).
Good luck.