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hi guys, ive upgraded my prestashop from 1.6.9 to 8.2 through migration, and since then, i noticed i am having 2 urls, one of them is 404 and the other is 5xx . these urls are 

/index.php?controller=product with 503

and 

/index.php?controller=category with 404

i couldnt even be able to know where these come from, and how to even remove them, are they a path for the product final url in prestashop?

are they related only to my 1.6 ?  and is anyone sure if it's related to my 1.6 if i can simply redirect them 301 to main page? i m afraid they could be a middle temporary url change everytime calling a product or category

one more interesting thing. i noticed in traffic and seo, where seo and url , that i have product section. which does not even have a product url. same goes for category. 

any hint would be appreciated. thank you.