Please provide your website url.
I need to physically take a look.
From what I see in the picture, it could be part of your image.
Please see screenshot of our demo image. http://prntscr.com/7co71p
You can see that it stretches to the bottom of the “learn more” button.
You images does not seem to be stretching full height.
I could be wrong, therefore I need your url to see it and troubleshoot using firefox error console.