Some other plugin is opening a different lighbox. Try disabling any recent plugin you may have installed (related to video or popup or lightbox or modal)
Recently, when I click on the gallery images shown on a page, instead of the full image, I see a video player with a black screen. I renewed my tokens and the same problem exists.
To see this issue, go to the URL below and click on one of the images near the bottom of the page. The images near the top are managed by Wordpress.
Forgot the key?