Curiosity; what causes many nameplate altitudes to be erratic?
Since the early days of my using MSFS I have noticed the displayed altitudes (and sometime displayed position) of other players often show a climb or descent then instantaneously snap to a significantly higher or lower level. Often the location will also snap into a different position.
Recently, I saw a fighter jet (I forgot the make) obviously running low and very fast through a valley and then instantaneously snapping back to the position I first saw them.
Even more strange is seeing a plane diving and going into a negative altitude of a few hundred feet before snapping positive again.