Website white listed but some pages are not?


Hi. I’m having a small problem with twitter cards white listing on some pages of my website. My website has been white listed for over a year now. I never had any problems with the twitter cards. Only recently after publishing a new project, the twitter card is not working. I’ve tested all the pages on the site and they are all OK except for the “Projects” for example;

These were working perfectly before now, as I said its only recently I’ve noticed it. I haven’t installed any new plugins recently, or changed theme. I will need to disable all plugins and enable one by one to see it there is a conflict with one of them. Is there any help or advise you can give?