Hi Kingston99,
It sounds like the PDF that you're converting was created from a scanned document. If that's the case (and you're converting from within Adobe Reader), make sure that OCR is enabled and that you've selected the correct language for text recognition. OCR is the process that ExportPDF uses to convert scanned text to selectable/editable text. This document explains how to disable OCR (just do the reverse to enable it): How to disable Optical Character Recognition (OCR) when converting PDF to Word or Excel.
Please let us know if you have additional questions.
Best,
Sara