Gallery FancyBox not loading images properly

Hello,

Every standard gallery that I create keeps loading 2 inexisting images.
Example:

1 – I create a gallery with 3 freshly uploaded images.
2 – Click on “image 1” and the lightbox pops up.
3 – Continue clicking to see “image 2” and “image 3” (the last)
4 – If I click again, instead of going back to “image 1”, I get this error twice: “The requested content cannot be loaded. Please try again later.”
5 – After this it finally loads “image 1” and the process repeats all over again as soon as I reach the last image in the Gallery.

Have read that probably has something to do with the FancyBox?

I dont know what else to do with this.

Need a very fast response. Thanks in advanced.