On the general store page, the discount is 25% for the basic edition (€14.99 instead of €19.99), and 35% for the Deluxe edition (€32.79 instead of €50.49).

BUT, when you (or rather I) go to the game's pages, the discount becomes 50% for the basic edition (€9.99 instead of €19.99), and 60% for the Deluxe edition (€20.19 instead of €50.49).

I don't know where is the mistake, on the front page or on the game's pages... But anyway I got the Deluxe for a 60% discount. Just telling you all, in case it doesn't last.

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EDIT: Silly cat... I should have checked the previous threads. This happens when you already own the diamond edition.

If you own the deluxe version should the regular EE version say OWNED as well. I mean I’d assume the complete deluxe has everything the regular EE version has. Looks like it.

No, it doesn't.
Strangely, only the Deluxe Edition I bought is marked as "in library", and the basic edition still shows as not owned.

Yann_Darko is correct. I also purchased Deluxe edition and basic edition is not marked as owned for me -_- It's not a big deal... but can be annoying for some people. Let's hope GOG fix this someday.

Maybe that's why owners of the previous game get higher discounts, because they only buy one game instead of two?

That's actually a good point - I should have seen that. All sorted then. Thanks :)