We inspected your issue and it looks like this happens due to WordPress and WPBakery page builder safety features, because we can see the same issue for WPBakery page builder built in headings element. Would it be possible for you to use other character instead of the brackets?
I will have to check if that is possible. When you say it is part of “WordPress and WPBakery page builder safety features.” Can you provide me with more details so I can share internally why we need to use different characters?
Sure, theme and plugin developers needs to sanitize user content before outputting it out due to various security concerns. By doing so some special characters could be changed in the process of making sure that it will be secure.