Gallery lighbox not working

Hi, I have created a gallery with lighbox option… but when I click on the image from gallery, it will open it in the same window, in the left corner or in the middle (depends on browser), not hovering over images with arrows to go through the gallery… where is the problem? I have tried also masonry gallery… I tried to do it on other installation of wordpress on other web page and there it works…

thanks…

Miro