i use apf script for my amazon shop site and it has duplicate meta title. is this why my site is in sandbox now?
May be it can be one of reason or you may have done link building in extra or may be some or other reason but meta tag copyright can be one of reason
what is apf? could you explain this? what I knew is, when it is duplicate meta tag, it can decrease of SEO value. You can check in _http://validator.w3.org/