Background issues

Hi everybody!

I am having troubles with the background responsiveness.

In particular, i have problems with the third page. In order to be good, i have to put a custom background for all the breakpoints except the main one. I do not understand why since with the previous page i have no problems. I could leave it like this but i really do not like to think to a person having another device size and not visualize it correctly.

Could you please tell me what is wrong?

Thank you so much in advance.


Here is my site read Only link:

https://preview.webflow.com/preview/portfolio-4b4a63?utm_medium=preview_link&utm_source=designer&utm_content=portfolio-4b4a63&preview=bc07324833565dea2a282551e9b65280&pageId=665863aad8a6467b914f057a&workflow=preview

The issue went away when I reset the background-image for all screen sizes except for the main one.