
I've seen this output before but only much later than the calibration so I didn't know where they were coming from. But now it makes sense I recalibrated some time before seeing them so I can confirm. 馃憤
Looks like QGC is handling the messages reported with https://github.com/PX4/Firmware/blob/7b4ae7c6586bcf355beda3741850a0b2c8532cb4/src/modules/commander/accelerometer_calibration.cpp#L335 but for some reason the end gets put out to the user. Line number will change after https://github.com/PX4/Firmware/pull/15235 but presumably it's still there.
Oh! It's simply the message spilling over. Thanks @MaEtUgR
QGC has "special" (hacks) handling to hide the [cal] prefixed messages, but not the next line if its split.
Ah right and before the line splitting it just got cut so no one saw it 馃挕