MLAT height different in PiAware and Virtual Radar

I feed my PiAware outputs to Virtual Radar, and have noticed that sometimes that the altitude results via MLAT differ.
In PiAware they seem reasonable (e.g. 2625 ft for a helicopter), but VirtualRadar reports the same aircraft as GND.
The position and speed data agree for the two maps.
Am I doing something wrong?

VRS has a tendency to interpret spurious messages as a certain GND indication and then stick to that state for way longer than would be reasonable.

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