In the Show validation Errors behavior, you need to uncheck the "Set Focus to first invalid field" Option. Since you check boxes all share the same name, it cannot determine which one is the first invalid field on error.
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.