simple example OK, but my photo fail

[j2l]

OK, this is my first (edgy) try beyond the examples and I know doing support is not PhD cup of tea :)
I just want to understand what is wrong with my settings. Thank you.

I took a 360 picture that includes me and someone else taking the picture.

I'd like to clone some parts onto others so I made guides:
a source:

and a target:

Yellow gradient is the same (like gradient on the rock example), then the other colors are for cloning guides.

Of course, everything matches and pics are same res.

I added lines onto the green mask to help follow the lines, like positioning guides within segmentation guides.

Result is wrong everywhere, even yellow gradient:

Pictures are the same size.
I also tried without curved guides and without the masks in the bakground (cars).
I even tried with same source and target:

I tried with JPG and PNG, same kind of result, almost the same result in fact, for instance: no tree in all cases, while it was not masked.

What is wrong?
Or is it a specific PNG settings, resolution?
Thanks