As @danb35 said, there is no problem with your certificate, maybe the problem is that you are trying to load an image from an insecure connection http://www.societeclement.com/images/Chat/Des-Questions.png so browers doesn’t show the green padlock. You should fix that link in your site and load the image from an https connection https://www.societeclement.com/images/Chat/Des-Questions.png .