I was planning a flight for FSX, I was cheking the real schedule to see route and altittude, it was CYUL to CYEG. But I noted something strange on the flight plan tracked by flightaware, it includes a deviation of planned route, with a sudden descent to 8,000 ft (from FL 360), and then going back to FL 360:
Does anybody know the reason? Was there an error with the flight tracker? Or was the reason a problem inflight?