Posted by: @blackraz

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please also check the table's character set

Apologies @BlackRaz - I'm not familiar with databases - is this what you mean?

I have another forum on the same web host that I don't really use any more, and that also has the same issue 

https://nutritionchat.net/community/chat-hello/test-post/

I did raise a ticket with my web host some time ago, before posting here. Personally, I think now the issue is on their side.

But they cannot see a server issue, and no one else has reported an issue (shared hosting) ... so all they suggest is a site restore.

Can you send the admin details to our support[at]wpforo.com email, to allow our developers debug codes?

Our developers have not identified any issues related to Unicode. It's possible that this problem is associated with LiteSpeed hosting. To investigate this further, could you consider cloning the entire WordPress site using a plugin like 'WP Clone' or another method, and then migrate it to a different hosting environment? After that, please send us the cloned backup to allow our developers to run it on our local machines for testing.