Tracking systems are a compete mystery to me. Remember being in Barbados a few years ago when FR 24 had some flights and Planefinder had others and some appeared on both. Never found out why.
Similarly last week in Madeira looking at Shipfinder, Cruise Ship Tracker and FleetMon to see what was coming into harbour and it was a compete arbitrary mix what appears on what tracker and occasionally 100,000 tones would appear with no warning at all.