If you, Traefik, and your origin server are on the same network, then it's going to be one hop regardless of whether you're hitting the Traefik proxy or the origin server. If Traefik is serving up the origin server's cert and not the LE cert, then Traefik is misconfigured to pass through instead of proxy, but I'm still not sure that's the case as it's almost harder to configure it that way than the correct way as a proxy.
What IP:port is your origin server listening on, what IP:port is Traefik listening on, and how is Traefik configured to reach the origin server?