SNAP 5.0.8 missing ascending information in export as gamma format

I am using Radarsat-2 images (Ascending) in Snap.
So what I did is a co-registration of two RS-2 images and an export as GAMMA format in Snap but also in GAMMA, afterwards I used the same algorithm to estimate canopy height and the results were terrain corrected again in Snap. But after the terrain correction, I realized, that the result registered in Snap was mirrored/flipped by 180°. I checked both the created .par files (GAMMA and SNAP) and the heading has a difference of 180°.
So my question is, is Snap taking into account the ascending information wrong or is it missing while creating gamma format? Or is it maybe another issue in my processing?

thanks for your help,