My background image on SASS isnt appearing when I publish the repocitory

[FrancoKohler]

I have checked this a few times, I tried chaging the images from .PNG to .JPG, chaging the routes and all but cant get it to work.

https://github.com/FrancoKohler/PetGO

the images are going from:
_mainaplicacion
_mediaquerie320-650
_mediaquerie651-768
_mediaquerie769-991

Its my first complete project but cant see it