orientation change after 3dZcat

Hello,

I am currently using tedana_wrapper.py to combine multi-echo data. The script runs smoothly, but the optimally combined data appears to be tilted.
Looking at the intermediate files I can see that this happens after applying 3dZcat (see attached, before and after).
I would really want to prevent the change in orientation, is there any way I can do this? The program does mention that I should consider running 3dWarp -deoblique, but this just does the exact same thing to the orientation.

Many thanks
Best regards,
Bram