Hi. please check fancybox integration. it seems not work even on your demo site.
here is your demo URL:https://techydevs.com/demos/themes/html/trizen-demo/trizen/tour-details.html
Thank you for reporting. We have checked and found it is working. Here is the screen record https://youtu.be/Td49ZGgPvsU
Could you please show us a screen record as well as your browser console so that we can reproduce the issue and fix it asap?