All the informations on

www.viefrancigene.it

This is the official italian route, approved by Italian Ministery of Cultural Good.
The official GPS track is by Alberto Conte from "MovimentoLento"
www.movimentolento.it

The GPS track on Wandermap is by CamminandoSullaViaFrancigena who walked on the official Way and recorded it by own GPS. 
CamminandoSullaViaFrancigena also has normalized the track by himself and published it here