Error in flight tracking MU517 saturday, 17 october 2015

Tracking the flight :
Shanghai Fukuoka China Eastern Airline MU517 10h10 → 12h45 saturday, 17 october 2015 … /ZSPD/RJFF
Looks hijacking ! ! Why ??

And there is real FLightaware data (not estimated) in the middle of the flight, but far away from the straight route !
There was no problem with this direct flight Shanghai Fukuoka. Only a tracking problem.

Thanks for information.

China Eastern 517 (suivre le vol entrant)
CES517 · “China Eastern” (tous les vols)
Int’l de Shanghai-Pudong (ZSPD / PVG)
Porte 29

Fukuoka (RJFF / FUK)
Terminal I
10h29 CST

12h44 JST
Prévu: 10h10 CST
Moyenne: 10h13 CST

Prévu: 12h48 JST
Moyenne: 12h55 JST
Autres vols entre ces aéroports
Durée: 1 heure 15 minutes
samedi, 17 octobre 2015
Statut Arrivé il y a 7 jours (journal de vol & graphique)
Avion Boeing 737-800 (biréacteur) (B738 – photos)
Vitesse Plan de vol: 371 kts (graphique)
Distance En ligne droite 858 km Prévue 858 km Parcourue 3.517 km

Generally this sort of thing means that there was ambiguity in matching aircraft up with planned flights.
e.g. something took off out of HKG with a callsign that matched the MU flight, and there was no better data to contradict it until later.