I was trying to do a re-process of the Crescent nebula and made a mistake on the NBRGBCombination stage. I had my narrowband captures rotated 180 degrees to my RGB and had forgotten to crop them using Dynamic crop. The result I got was somehow pleasing (from an artistic point of view), so I am going to keep it. What amazed me was that platesolving still worked on the original image (see end of this post).

Here's the original:

The Crescent Nebula as you've never seen it

Here's the original:
The Crescent Nebula as you've never seen it