Why occur frenqtly preflight accel Advice

Hi, I’m using px4. but it frequently show warning message.
Message is Preflight accel Advice.

According to my experience, It warning message related in temperature.
I calibrate in Inside. And Drone took out outside. Drone shows warning message.
And, I calibrate in outside. It works very well.
Against. I calibrate in outside. And took out inside. Drone shows warning message.
And, I calibrate in outside. Temperature change dramatically, it show warning message.

So, I analyze code about Preflight. And I founded code.
(file : src/modules/sensors/voted_sensors_update.cpp line:786 function: calc_accel_inconsistency)

It just seems compare different two sensor and add different value.
Compare different value and COM_ARM_IMU_ACC parameter.

What result are expected this algorithm?