Old version of website shown, what could cause this?

Hi, @Blake32p. I also notice that this site is using a service worker:

Service workers act as an intermediary for any HTTP requests for a domain/site. They can, will, and often do override what Netlify will send as a response in many cases. If you are seeing an incorrect version, it can be helpful to double check if that content came from Netlify or from the service worker using the local cache.