first bug is a vertically flipped png in the preview which isn’t flipped in the source file.
Second bug is a horizontally flipped DDS in the preview which isn’t flipped in the source file.
If we now flip it in the source it gets both horizontally and vertically flipped (kinda intended considereing the DDS flip bug):
Settings used in PS for the originally unflipped DDS:
Original files: http://alrik-online.de/alrik/screens/textureBug.zip
Looking forward for an answer