Board Thread:Support Requests - Getting Technical/@comment-36025526-20180707102526/@comment-27345308-20180707112529

There isn't anything you've done wrong. Tabbers are generally not considered a too good idea and you should try to avoid them as much as possible. Perhaps the community could put an  link next to the tabber that opens the source mode editor so tabbers can be edited?

You can also report that as a bug so Staff can improve the Rich Text Editor's tabber handling.