it looks like the Main content div is missing.
you have a left content div and right content div, but no main content div.
when you add a form to the main content area, since there is no container div, it is not aligning correctly.
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.