Issue with two lightboxes

Dear Rais Degar,

Thanks for your post.
This probably happens because your theme has a lightbox functionality included in it. Please try to change your theme to a default WordPress theme for a second only in order to check if the second lightbox disappears or not. And if it disappears then it certainly it works with tag as our lightbox does, so why both of them appear simultaneously. If you wish to use the lightbox of a video gallery plugin, then you need to contact your theme support and ask them for disabling the theme’s lightbox.
Please, inform us about your results.
Thanks in advance