Inconsistent behavior with enabling acceleration sampling

I am running a modified version of the Sample App - Freefall Detector to stream acceleration values onto the Console. I enable the data sampling as said below and stream at ODR = 25 Hz.
https://mbientlab.com/cppdocs/latest/accelerometer.html#acceleration-sampling 

Similar to the Sample App, I select the sensor device and go to the DetectorSetup page. I notice inconsistency here in the way that the streaming does not wait for me to press the Start button. Sometimes, it starts automatically, bot other times it won't.

Any explanation for this behavior would be highly appreciated.

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