Hey, I found strange thing.
Not all my menu items create duplicates.
I have this categories in FC:
Cars
-New Cars
--Sport Cars
---BMW
---Audi
-Used Cars
--Sport Cars
---BMW
---Audi
So, when I create menu item (Top Rated Cars) on parent category Cars with specific filter and order - urls in this page are CORRECT!!!!!!!
site.com/cars/used-cars/sport-cars/bmw/item/15-some-car
Breadcrumbs:
Home -> Best Cars
Now, I want to create page with top rated used BMW cars.
So, I duplicated this menu item and changed category.
I ONLY changed category!
Also I changed alias - top-rated-bmw-used-cars
But now, link have urls like:
site.com/top-rated-bmw-used-cars/item/15-some-car
Breadcrumbs:
Home -> Top Rated BMW Used Cars -> Sport Cars -> BMW
SO, this is BUG. It happens on with 5 level depth.