Step-1: Please login to your Cpanel.
Step-2: Find the option Mod security in your cpanel . Check the image below to know where you can find that.

Step-3: Disable Mod Security for the domain you want to fix the publishing problem.
Be adviced that you should Enable Mod Security when you are done. If you are still facing this problem , Please contact our customer support by creating a Support ticket or by Live chat.
Thanks