Hi, The ja-purity-iv template damages the operation of fancybox, glightbox, sigplus and etc plugins for mobile devices.
For PCs, plugins work normally, but for small screens, the image after clicking is outside the screen.
I asked the professionals they said that the problem could be the use of the z-index by the developers in the template code.
On the built-in joomla template cassiopiea, the plugins work correctly. You can do something to normalize work with the template. I liked the template and want to use it for my site.