i’ve change the name of a category, but i’m continuing to see the old category

I’ve change a category name and slug, from “dog” to “cat”, but now i have correctly category/cat/pitbull but also category/dog/pitbull

if i go to category/dog/ it return 404 error, i don’t know why it doesn’t return 404 error also for subdirectory

how is possible ? I don’t have any cache plugin, i’ve delete my local cache, i don’t have any idea….