alt Hacker NewsA lot of the trackers miss the trains because trains occur within the first few orbits after a launch. So if they don’t start recording data until some delayed event, they miss it. I had this problem a lot with live night sky trackers not showing the trains despite me seeing them quite clearly.
It might also be taking the latest TLEs for satellites, I don't know if there's a database of historical TLEs, so it would only show the current orbit