Hi @mbailey - welcome to the farmOS community!
Looks like some of your CSS is broken. Not sure why…
One very simple thing you could try is clearing the Drupal cache. To do this, go to /admin/config/development/performance and click the button.
Drupal aggregates CSS and JS files (if that’s turned on - you’ll see those settings in the same page), and it could be that there is something wrong with those aggregated files.
Another thing to check is your browser’s dev tools. Look for any errors in the console. Also go to the Network tab, reload the page, and skim through the requests to see if any are failing. The aggregated CSS files will be in there - so it’s possible that they aren’t loading properly for some reason.
That could be related to your reverse proxy config, and might explain the issue… if for some reason these CSS files are being cached by the proxy, or they are not being routed properly.
Hope that helps! This is definitely a lower-level Drupal hosting issue, not specific to farmOS - so you could also consider asking for support in the Drupal Support channel on Slack: https://drupal.slack.com