[MM3-users] Hyperkitty CSS issue

I migrated my existing mailman3 install from using the Debian packages to a virtualenv setup. For the most part everything seems to be running fine, but I'm running into an issue where Hyperkitty 1.3.3 is referencing an incorrect CSS file. It is trying to load "/static/CACHE/css/hyperkitty.39ef00cc7454.css" which does not exist. If I replace that reference (using my browser's dev tools) with "/static/CACHE/css/output.12a071da81b1.css" everything looks fine. I've ran the collectstatic, compress, and migrate commands successfully with no change. Any ideas on how to fix this?