Content on pages is disappearing

I have several pages on my website where the content has disappeared and now shows “Nothing found”. When I first set up the pages using a plugin called T2Toolkit for my Workout Theme, they worked fine. Now they won’t display any content. Here’s an example of some of the pages having this issue:
http://www.crossfit55.com/galleries/barbell-club-pictures/
http://www.crossfit55.com/programs/crossfit/
http://www.crossfit55.com/coaches/richard/
http://www.crossfit55.com/galleries/our-gym/