Sometimes one of the elements in the Style Editor may end up in the clipboard area and cannot be moved back using draggable options.
There are 2 options to fix it.
Inside the Style Editor, add a module called 'Spacing' with a height of at least 150px. After that, you'll be able to move the tables to the Style Editor area.
In the second option you can also move it to the content section
Clicking the "Edit HTML" button you copy the source code
Next, add a new 'Tables' module directly inside the Style Editor by pasting the source code into the new element