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Some clones have problems with regulator ripple that disturb pressure sensor, one bypass capacitor C9 does not match the regulator used as replacement by the cloners.
Revolution board
To resolve this issue you can remove the C9 capacitor (better without) or replace with a 100pF capacitor. Some users reports good results adding another capacitor to regulator output.
Sparky board
To resolve this issue you can remove the C8 capacitor (better without) or replace with a 100pF capacitor.
Monitor altitude
Altitude can be monitored using the Scope tab, the second scope display big jumps in altitude
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