I get the same problem. The Text/HTML editor adds all sorts of div, p, and br tags all the time. Usually, I have to use the text/HTML element to the the DnD code, but then go back to the WP Visual and/or Text editor to format. I also can’t get some of the buttons to work on the Text/HTML. The make hyperlink, insert image, font, font size, style, font color, .etc don’t work. The Bold, Italic, strikethrough, bullet, align, outdent, .etc DO work, except for all the added tags mentioned above.
FYI, the added tags don’t show up until you insert shortcode and save changes. When you go back in, all those extra tags show up.
