Most likely it is a terrible PDF. PDF is so terrible, terrible I wish it was extinct.
When you view it on your computer or in "S" font size there is no reflowing happening. When enlarging fonts, the reflowing takes place. PDF is not suitable for reflowing and it depends on PDF itself how it suceeds. In your case you have got inadequately formatted PDF.
For example, I have many PDFs that split words in lines.
Solution: try to convert the PDF to different format before moving to e-reader. I would go with OCR.
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