Category Image Box decreases in Height

Hi, I have your theme up and running a few months now on a clients website. I had issues last week with visual composer. It stoppped loading on admin pages. So I deactivated it, deleted and reinstalled it. All was fine after that. Not sure if this is related to my current problem. When i go to edit pages with catagory Image boxes on them, the boxes shrink in height. Not sure how to fix, boxes are set at 300px high….would appreciate it if you could point me in the right direction. Thanks, Mark

screenshot : http://www.pixhoster.info/f/2016-09/02db731692e0693dfc4339ec0c6bf260.png

Ticket