By any chance are you using Joomla 3.7.0 ? I believe this is a bug in 3.7.0 which Joomla has already addressed in 3.7.1. It has something to do with their input filtering on unicode characters. You can read more about the changelog for 3.7.1 on https://www.joomla.org/announcements/release-news/5705-joomla-3-7-1-release.html

I`m using joomla 3.7.1, but I suppose they didn`t fix the whole problem.

Hm, if you copy your html.txt contents into Joomla articles and try to save it, do you hit similar issues?

So it works with joomla articles, it saves fine and there are no problems displaying the article.
https://www.lol.social/test

It seems like i find out our smart search plugin "Smart Search - EasyBlog Posts" causing this issue, can you try temporary disable this plugin and see how it goes?

If that is the plugin, i will lock this issue into our issue tracker.

If that is not, can you provide us with your Joomla backend and FTP access so we can better have a check?

I have disabled the "Smart Search - EasyBlog Posts" and still got the same problem.
I have updated the post with the login credentials.

It seems like i was unable to replicate once you disabled that "Smart Search - EasyBlog Posts" plugin.

I've tested submit a new post from backend and frontend using you provided that content, it seems work fine.

But i realised when i submit a new post, it will hit 1 error you can check my attached screenshot below.

After that i changed it, it can able to submit post.

But I`m using the built-in easyblog composer.

Hm, based on what you provided us that html file it contain all the HTML code but do not have these composer block HTML :

<div class="ebd-block  " data-type="text"></div>

Perhaps you can keep one of the existing blog post which having this issue, so I can directly check on your site.

I don`t see why it should have that html tag if I am writing the html code and then pasting it into the composer's html editor. Until now I didn`t have this problem and I see that this is not a problem from my side, I have tried doing the same on the demo page here http://easyblog.stackideas.com/ and got the same results.

The reason why you having this issue on our demo site is because we do not have disable this "Smart Search - EasyBlog Posts" plugin from our demo site.

I don`t see why it should have that html tag if I am writing the html code and then pasting it into the composer's html editor.

May i know when you mention this "composer's html editor" is it you referring Tiny-MCE/JCE-editor or Built-in composer using HTML block?

I`m using the HTML block from the built-in composer.

Alright, now i totally understand, it seems like hitting timeup issue :

404 Not Found

nginx/1.10.2

Can you consult with your webhosting provider to help you increase this "max_execution_time" to 500 from your PHP server and see how it goes?

If the issue still persists, is it can request with your webhosting provider to help you setup a FTP user account so we can able to modify the Easyblog core file through 3rd party file server program? Because if debug through your backend Phoca component, it will not too safe is because if that is any mistake during editing the file, it probably unable to go back backend and do not have a chance to allow you edit back the code from backend.

I have increased the max_execution_time to 500 and still the same problem and I have noticed that the post gets saved in the database but everything is NULL.

I have updated the post with the FTP login credentials.

Thanks, I can connect with your FTP server now, but it seems like when you update your FTP details at your first post, those Joomla backend user details is missing now, is it can update your Joomla backend user access again?

I already made this thread to private now.

Post updated with the credentials.

Thanks, I can connect with your FTP server now, but it seems like your current FTP user account do not have permission to modify the file on your server, this is what i hitting now when i save the file.

Error:	/administrator/components/com_easyblog/includes/post/post.php: open for write: permission denied

Error:	File transfer failed

I have changed the permissions and all should be good now.

Is all good now, the post saves just fine and it displays as it should.

Thanks alot for your help!

Thanks for updating Bogdan, glad that your issues are resolved now.