Sorry to bother. I've been bashing my head for some time. I've got in every product page the canonical url like
<link rel="canonical" href="https://www.website.de/canapes-panoramiques/873-canape-panoramique-panamax.html">
but it doesn't redirect to that. It is generated by the module: "URLs SEO Canonical + Google Hreflang Pro", unfortunately the support time has ended, but i don't think it has anything to do with the module.
I've tried getting the url on the listing tpl, i've tried forcing the domain to www. , i've tried redirecting with htacess, i've updated the module, searched every option in prestashop... the issue might be simple, but i don't see the problem.
Thanks is advance.
EDIT: After more inspection, i think the canonical has a status 200 (sucessfull) instead of 301...