You have two objects in the header. Both are floating graphics but their positioning is not set correctly.

First, the graphic's grey splash needs to be long enough to bleed off the right side of the page on the landscape page. At the moment it bleeds off the right on a portrait page but is too short if positioned the same way on landscape.

Once you have the graphic fixed, you need to look at its positioning and align it to the Left of the Page.

Then with the text box, you want to change its position to the Right of the Page.

Then you can use Same as Previous for those headers and the text box will automatically position itself relative to the right side of the page regardless of the page width.

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Andrew Lockton
Chrysalis Design, Melbourne Australia