Should PDF output look wildly different than layout? (using WIP)

I’ve been creating Layouts so I can print collections with whatever updates I’ve made since the last set. Today in the Rhino 8 Beta I see a new surprise in the PDFs Rhino generates: despite the layout having one image arranged to take the width of an 11x17 sheet, the PDF shows multiple rows of little tiled versions of the image I want large in high res.

This is different from the Rhino rendering with parts of an object missing, which I’ve also encountered.

(Rhino WIP on M1Ultra)