Pretty Clean URLs module

[Serena5]

Hello!

A couple of days ago I installed a module on Prestashop called "Pretty Clean URLs" https://mypresta.eu/modules/seo/pretty-clean-urls-pro.html that removes the id off the URL and I activated it for products and for categories. Everything worked okay for products but I have been having a problem with the categories. 

I have a main category called "Marketing Materials" whose old URL was  "http://test.com/en/169-marketing-materials" and now it should be redirected to "http://test.com/en/marketing-materials" but because I also have subcategories with the same name "Marketing Materials" the old URL it's actually redirected to  "http://test.com/en/maincategory/marketing-materials".

I have tried debugging the module but as far as I could tell the URL it's already set in that format and I want to know if there's a place where it's being saved like this where I can change it or can somebody explain to me how the creation of the new URL works.

Thank you in advance!