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I wonder if the original PDF was perhaps also a graphic file, such as would be created by scanning a paper article and saving the results as a pdf.
I myself had a similar experience with a graphic-based PDF. Before the conversion to Kindle format, you could at least zoom, but after using the Convert email function I could not. It did not much matter, because it was too frustrating to read either way.
Fortunately, the great majority of pdf's on the web are not based on scanned images.
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