Pressure Sensor:
A common shift in value can often be observed after you measure the pressure inside a water container and it’s change with depth.
The pressure does not drop back to the standard pressure of the surrounding.
This occurs because some amount of water stays inside the tube due to capillary action. A common fix to address this issue or similar issues is to clean the tube properly before you start the experiment and shaking it after you have dipped it in water.