Thunderstorm Height

A thunderstorm usually has an upper ceiling of at least 36,000 and can be much higher. Yet I can fly over them in Brazil at 22,000

Anyone else seeing this?

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This simply may be an issue with live weather interpolating the data – however, a thunderstorm CB/TCU can certainly top out at FL220.

The height of thunderstorms depends on the instability in the air and strength of convection. Sometimes you get towering cumulus clouds but sometimes stable air inhibits their upward growth. Do you have any METARs from the area at the time?