Hasta La Motion!

i am actually trying fusion as compositing software ( so i am kinda a newbie)

i was just trying to merge several pics between them just for testing, i choose one of my vehicle render, it appear well in the assigned viewer, then pick a random background from a stock in DA, save it, create an other reader, import the pic and put it in the second one, and it appear like the attached pic, it looks twisted in the viewer, i try to tweak the pic , save in TGA, PSD in photoshop, nothing works.

i tryed to look at pixel ratio, square, the background get the same aspect ratio of my working vehicle pic, i tryed to tweak the import settings, do not work…

i tryed with several pics, some of them works, some do the same , and gets like this,

so the question, did i forget to tweak something or turn on an option?
or maybe a picture protection? i am trying nuke too, and the pic is nicely imported, no distortions…

thanks