On firefox it's returning 6 resources(correct) and on Chrome or IE it's returning only 5 resources. All cache are diabled in modx and I clear the browser's cache and restart them... Do you have a clue ?
Thank you Paulp for your answer. You were right the problem appears when I am logged into the manager on one of the browser, it makes my 6th resource appear. BUT this resource is correctly published !? Do you see a solution ?