Question Problem with responsiveness on bigger screen size

[Ness]

Hi everyone,

I need some urgent help with a site i am designing. The page looks fine on mobile, tablet but when viewed on a bigger screen (2560px) one of the shapes (png) in the background is being cut off at the bottom, like this:

I have set the section to 'stretch section'. Any ideas on avoiding this?

Thanks for the help
Vanessa