Hey there,
I am really sorry for the delay of this reply as it is a weekend for us here.
It seems like this plugin "Shortcodes Ultimate" striped these space html code <br>, I have temporary disabled this plugins, it should work fine now.
By the way, if you really want to use this plugin, you can enable it back, but you have to turn off Easydiscuss "Content Events Triggers" feature from backend > Easydiscuss > settings > general > composer
So this will not affect the Easydiscuss content when you enable 3rd party content plugin.