Good evening Adam and welcome to the Events Calendar Support forum!
Thank you for reaching out to us.
I would love to help you with this topic.
Since the photo and the map views are deactivated on your site, it makes it a bit difficult to troubleshoot.
However, could you please send me a copy of the latest version of your WordPress theme / child theme via a link to a .zip file link (stored Dropbox or Google Drive) so that I can run some tests on my end ? I recommend a private reply for that purpose.
Please ensure you are using the latest files as found on your actual website.
This way I will get access to any updates or customizations you might have made.
This way I will have a better idea of what is going on.
As for the custom CSS, have you tried placing it in Appearance > Customize > Additional CSS ?
Hang in there!
Geoff B.