This is a rare issue, likely due to a jQuery conflict on your site probably caused by another plugin or your theme.
Please try the following:
- Upgrading your theme to the latest version.
- Upgrading all plugins to the latest versions.
If this doesn’t fix it please try a conflict test:
- Temporarily switch to a default theme and see if this fixes it.
- Temporarily disable your plugins one by one, and see if having any of these disabled fixes it.
If all of the above fails, please feel free to get in touch for help.
Alternatively, you can go to the “Debug” tab in your plugin settings, then disable the “Ajax Loading” option: