Links to my forum do not work when posted to social media

There are no restricted topics, it’s just a normal forum.

I tried hiring 3 different people on Fiver and no one could advise me what is wrong.

I just noticed, that actually any direct hyperlink to a thread on the forum will lead to a broken page showing just the thread title but a blank white instead of its content.

If I just put a link to any thread on the forum into a browser - a blank page opens. When I click on the same page directly on the forum, it opens without issues.

The issue started happening since we restored the forum from a backup.

When I have it installed for the first time, everything worked normal till restoration from backup.

Is there anyone familiar with Discourse who provides paid services of fixing Discourse related issues?