Digital and scanned pages
Most PDFs contain their text, which is read instantly and exactly. Pages that are pictures (scans, photos) have no text inside; they are drawn and read with OCR in the language you choose. Each page is marked in the result.
Need the tables in Excel instead?
To keep rows and columns, use PDF to Excel - it rebuilds tables with real numbers and dates.
Questions
Why are some lines in an odd order?
Text in several columns is read in the order the PDF stores it. For tables, PDF to Excel keeps the layout far better.