Header Image impossible to replace

Good morning,

i’m trying to replace the header image in the Foodeez Options and it’s completely impossible. Every time I change the image, the home page loses the image. And the same happens with the Inner page heater background. How could it possible? What can I do? I tried with the right sizes and some different ones and no one works.

Please, let my know as soon as possible.

Thanks and regards,
Marta