Seems i have again a problem, that i thought to have solved it.

My links come from an external source, they are added directly by a script to table Links/CatLinks.
To fix the number of Links i use Database > Repair Tables as usual.

Now i have

USA (608)
> Alabama (0)
>> Auburn (1)

I have checked the dataset of Alabama, DL and NoL are 0.
I have no idea why the root cat is calculated right, the level2 cat is calculated right, but the one between not.