I use Flight Radar 24 on my iPad to track friends/families flights when they are traveling (not paranoia, just curious). I've noticed that, quite often, their plane will jump from one location to another, or jump backwards down the flight path, or zoom forward, or any other number of motions that I assume the plane isn't actually making. (My personal favorite being when they miss the runway on touchdown and the plane disappears. If that actually happened as often as Flight Radar 24 made it look like it was happening...)

What makes the planes do this on Flight Radar 24? Why can't it just track the planes correctly?

I use FlightRadar24 on my iPad to track friends'/family's flights when they are traveling (not paranoia, just curious). I've noticed that, quite often, their plane will jump from one location to another, or jump backwards down the flight path, or zoom forward, or any other number of motions that I assume the plane isn't actually making. (My personal favorite being when they miss the runway on touchdown and the plane disappears. If that actually happened as often as Flight Radar 24 made it look like it was happening...)

What makes the planes do this on FlightRadar24? Why can't it just track the planes correctly?