We're sorry for the delayed response and inconvenience caused. As per the description above, I can understand that when you are exporting a PDF into Excel document, the last line in the document is missing, is that correct?
As you mentioned that you already tried the online URL https://cloud.acrobat.com/exportpdf and the desktop application Adobe Reader but you are getting the same result with the PDF.
is it possible to share the PDF file and the exported Excel file with us so that we can test it at our end? To share the file, please use Adobe Send feature, login to https://cloud.acrobat.com/send using your Adobe ID(email) and password, upload the file, share the link to files via private message only, How Do I Send Private Message