The red exclamation means that there is code on the page Dreamweaver does not recognize, if the page works fine in the browser, you can ignore the exclamation marks, if not, then you should investigate why.
As for the trigger, you are using Dynamic Plugins.
Dynamic plugins are meant to be triggered on a specific value, Session, Post or GET. If you don't need a trigger, you shouldn't be using dynamic plugins, you should be using standard plugins.