Sometimes, the old containers get stuck (not killed) if I switch from the -c to -d flag or change things up in the configuration. The error message from Traefik is kind of cryptic.
Router defined multiple times with different configurations in [app-web-hash app-web-production-otherhash]" providerName=docker routerName=intracar_secure
The solution is to kill the old containers, and the new ones magically work.