On this site, https://www.dwlf.org/en/
There is an extra closing p tag without opening p tag in one of your content boxes.
Please check the spacing of your paragraphs. Broken HTML can cause the browser to interpret footer as an element outside of the “box”, causing it to be full width.
If you cannot find and fix the HTML, I will provide you with Custom CSS to “force” the footer into “box” mode.