I've had this picture rejected for 'editing'. The screeners comment read 'editing in the sky.
As you can see, there is something that looks like strokes coming down at an angle, right to left at the left hand side of the picture, left to right at the right. If you look close, you'll see that the strokes on the left are consistent to those on the left; it seems that these are actually concentric circles with the centre in the middle of the picture (before it was cropped). The original unedited picture doesn't show this effect, so it must have happened during editing.
How I missed this before uploading is beyond me ...
The thing is, I don't know what caused this effect. I don't remember every step I took while editing this picture. I most definitely didn't use the cloning tool ... Have anyone encountered anything like this, and if yes, what could have caused it?