I am not able to reproduce using the preset you attached. both the insert and update pages are generated buy the Data Assist wizard with the div around the html editor instance.
I tried in both DW CC and CS 6 on Windows 7
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.