Website pages not working

Hi! I came across an issue which I cannnot solve by myself. Our website which was working perfectly till this morning (Blade theme, WPBakery page builder) doesn’t show the pages if I click on the name in the menu. Only the “Hi mates, you are lost in treasure…” page appears. There is content in each of the pages, I can see it in the editor platform, but when publishing it seems the pages does not exist. What can cause this problem? Could you please advise how can I solve this issue? Thank you!

Contact your theme author for the support if you have “active” support period.