Hi Jayd,
Thanks for writing in! Upon checking, I see that you’re using WP fastest cache plugin. Could you please try disabling any CSS/JavaScript minifications on your caching plugins, purge your server cache and re-test this issue and see if that resolves your issue.
Also I see that you’re not using the latest version of Pro theme. You can check the latest version number from here (https://theme.co/changelog/) and update your Pro theme (https://theme.co/apex/forum/t/envira-gallery-missing/48545) to see if that resolves your issue.
If not, then you need to remove any custom CSS rules added to your site and re-test this issue further.
If you’re still having issues, disable your 3rd party plugins except Cornerstone, Envira Gallery and see if the issue is related to a 3rd party plugin. If the issue is resolved when disabling plugins, then you can activate your plugins one by one to see which plugin cause the issue.
If you’re still having issues, provide us with your WordPress login credentials in a secure note to check your issue further.
Thanks!