New Post: Strange behavior with some methods and getting 'childColumnStatic'

I know, but i tried to make it explicit to check.
By the same reason this portion is also commented.
The point is the different behaviors according to URL.
I would like to know if it's by design, bug or my mistake.
In case of expected result, I think that's safer to build my own cascade dropdown menu, because accessing web services manually I didn't found any problem. I will check as soon as I can :)

Thanks