Hello, main page slider on my wiki doesn't function.

When I click on a picture, it only shows it in a Lightbox. I tried all suggestions made by developpers on stackoverflow.com & One Piece Eng Wiki colleagues but none of it worked.

However, slider on One Piece Wiki Eng works perfectly but we have same CSS and JS code!! I don't know what is going on.

Could you help me please? I 've seen on Developper Tools that slider code on my wiki and OP Eng Wiki's code isn't the same, do you think that it comes from that?