Thank you very much for the response.
I am confused how my storage is different from the article you sent other than the naming structure? I am using custom storage.
As far as I can tell I have this:
Group X - custom - "article_tabs"
Text - custom - "article_tab_title"
WYSIWYG - custom - "article_tab_content"
And the document you sent would say it needs to be set up:
Group X - custom - "article_tabs"
Text - custom - "article_tabs[article_tab_title]"
WYSIWYG - custom - "article_tabs[article_tab_content]"
What else would need to change with my storage to get the Group X working properly?