Quatronion Reading Problem

[Abdelrahman97omar]

Hello every one.
I placed the IMU in the right pose, Z axis facing upward. And start the IMU mode (0x08) this means it should fuse no magnometer data and should always start at 0 orientation pose around Z axis. The problem is it always start with values around the following vlaues:
x: -0.0237
y: 0.000366
z: 0.98782
w: 0.15375

Which means around + 170 deg about the z-axis. Any one has explanation for this or I am missing something

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