The page layout is inconsistent.

Your first step should be to decide what the margin settings for the document should be, and then apply them consistently to each section. You also need to pay attention to the settings for header and footer distance which controls how far from the edge of the page the header and footer start.

Secondly you need to use Styles correctly. Headers should use the "Header" style, not "Normal". The indents you have applied to the paragraphs in the header should actually be part of the Header style so that they are applied consistently.

Footers should use the "Footer" style, not "Body Text" which has then had formatting manually applied on top.