[Solved] Selecting a language no longer works properly

[Frits van Leeuwen]

Hello all,

I have my webshop in Prestashop 1.7.8.9

For some reason, choosing a language no longer works properly. I have all my pages in Dutch and English. As long as I stay on 1 language (as a visitor) the site works very well. But now it appears that if I click on a category, a product or another page, and then switch the language, the page is not displayed. As if the page does not exist. But I'm sure he's there.
I can change the homepage without any problem. And also the contact form. It doesn't matter if I already have the language active or not.

If things go wrong, there will be /en/index.php?controller=category in the English URL or /nl/index.php?controller=category in the Dutch URL. Or... When I see a product and I select a language, Then I get controller=product in the URL.

I'm sending an image of SEO & URL Because maybe I have something wrong there. But I have no idea where.

Can someone help me think and maybe lead me to the solution?

Yours sincerely,
Frits van Leeuwen
Geschenkenlaantje.nl

Edited July 28, 2023 by Frits van Leeuwen
solved (see edit history)

[Frits van Leeuwen]

Found the solution myself.

The SEO & URLs settings I showed here were correct. Only those were set at "All stores".

I have now corrected them per store. Now it's all right again.