The web page popped by ion-item has duplicate ino-nav-view,and the scroll doesn't work

 I new a project as the sample chat, in the Chats, click the item to popup ChatDetail web page,but there are two <ino-nav-view>..</ino-nav-view>, one is the first web page Chats, other one is Chatdetail; It make the scroll doesn't work.But I refresh the page, the scroll  works well again! And the  html body have one <ino-nav-view>,is Chatdetail.