Thanks Andrzej,
It seems like your site is not using the project pages template for some reason. Could you screenshot the settings page where you have templates settings, and ideally go to https://rebbe.be/projects/obe-rebbe-se/ and click ‘edit site’ and screenshot that.
If you’d rather not share those here, or would prefer to get help via email please drop me a quick message via this support page and I’ll help you resolve this by email:
https://projectpages.io/contact/
We’ll get your pages displaying right ??
Cheers
Woody