Only some pages showing trim and registration marks

[fredl65064644]

I would love it if someone can tell me what's going on with this PDF. 
Preferences is set to show all boxes (art, trim and bleed).
Some pages are trimmed to the page size, without any trim or registration marks. This is the way the page shows in regular view and in the crop window. See AcrobatPageView1.
Other pages show the trimmed size in regular view but show the trim and registration marks in the crop window. See AcrobatPageView2.
I cannot get rid of the trim & registration marks on the pages that show them in the crop window. So when I go to apply a uniform page size, it crops pages differently.
I've never seen anything like this--why are not the crop and trim marks showing in the regular view? How can I get rid of them? Why don't they show for all pages?

[Karl Heinz Kremer]

Page sizes and the associated page boxes are page specific. Especially when you assemle a document from different sources, the way pages are confiuged may not be uniform. You can use the preflight tool to first of all get an idea about what your page boxes look like, but also to  change them so that they match your document and your page content.