Can someone explain an estimated altitude drop of 30,000?

On this flight?

flightaware.com/live/flight/VIR1 … R/tracklog

It’s worrying me. Many thanks, Tom.

It’s a presentation error since not all of our data sources provide altitudes.

The displayed altitudes should be correct, the climb/descent rate is wrong.

Thank you, I was tracking a flight family was on and not really knowing how to read the data properly, panicked a bit!