A screenshot is pretty useless, as I can't tell much from that.
Check if the {article} tag is there in the actual HTML output (view source, not the element inspector).
If not, then that slider thing loads the content in via ajax. And it would be down to them to pass the content through the Joomla plugins.
Can you give me (super) admin and (s)ftp access so I can take a look?
And tell me on what url I can see/reproduce the issue.
You can use the 'Confidential information' button in the forum editor to hide sensitive information.