can someone tell me what this is in the red circle?
It looks like that only shows up when you select the text with your mouse? If it's not affecting the layout of the page by default, I wouldn't worry about it.
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.