Hi Dennis,
yes, they have the same ID but in different sites. If you check the page again (https://www.bonus.net/no/casino-bonus) you can see that the link generated for the Spanish version is correct because is the only related page that in its own site doesn’t have the same ID that the other pages.
<link rel=”alternate” hreflang=”es-es” href=”https://www.bonus.net/es/casino” title=”es_ES”>
You can check the ID of the other pages in the body element, it will be always 7824
What I mean with the “configured” slugs is that the permalinks and slugs are ok. I already double check.
Btw thanks for your quick answer.