boxed layout color section backgroundimage

Hey,

I chose the black color scheme but changed it to boxed layout. Unfortunately if I insert a background picture in a color section and adjust it to the left or right, it isnt shown correct. Dimension of the max. width is 1340px, ratio is 77%/23% and together is 100%.

It looks like image is adjusting to the left or right border of the site and because of the boxed layout, the background picture of the boxed layout cover this part.

When I change the side to streched layout, the backgroundimage in the color section looks proper. The missing part is shown because it isnt covered from the boxed layout design anymore.

What can I do, that the background image starts at the border from the color section an not at the border from the website when boxed layout is chosen?