Here are the details:

I got 2 handed weapons on 4/5, it is on 60 right now and the last 1/5 can be acquired when you reach 80. Good so far.

I have also thrown 1 or 2/5 on the next skill that reduces stamina cost of power attacks. Problem is I can not level this any more for some reason even if it seems I pass the requirements. I believe the required points are 20 and as I said I have 60.

What am I getting wrong? Any help appreciated.

Might have a hidden requirement of the 5/5 of the first perk?

OK stupid question. Just realized that some skills are not meant to level any more, you just select them once and that is all.

////Double coffee for me/////