Problem When Saving Images And Upload Them To Admin + G Shoppin

[PrestashopTrackglobe]

When someone comes to any product in my shop:

 

http://www.eluniversodelperro.com/2536-royal-canin-sterilised-37.html

 

and clicks on the image to increase the effect Fancybox the image opens fine, but if we keep somehow hidden or something saves it with a small black border filling.

 

This is an example:

 

http://www.eluniversodelperro.com/alimentacion-pajaros/1882-verduri-25-kg-8012550071098.html

 

This may not be the problem, maybe a thing that I have messed with the code for use atFancybox throughout the store and open popups.

 

Any ideas?

 

Thank you very much for everything.

 

A greeting.