Do You See Lines?

[wideangle]

Maybe it has something to do with Post Processing?? - as here is the same image crop unedited (from Canon DPP):



And then the edited version that was originally posted (edited in Raw Therapee):

[Tannin]

The DPP version is fine, the edited version has the lines. It's not the camera.

[wideangle]

Even dragging levels to the extreme ends of the Canon DPP image, I don't see the lines:

[Tannin]

I did the same, WA: levels, contrast, colour, the lot. It starts to look as though Raw Therapee must come under suspicion.