Doug,
Thank you for sharing the information.
As you can see that the PDF producer is not Acrobat that can case this issue.
You can flatten the document at your end. The Adobe Acrobat 'Print to PDF' feature flattens the document and reset all the settings to their defaults.
To run a document through the 'Print to PDF' feature you will want to open the PDF, select File > Print > then in the drop down list next to 'Printer:' select the 'Adobe PDF' option. Then click the Print button, you will then be prompted to browse to a location to save the newly flattened PDF.
Now use this flattened PDF file to Edit & Save.
Let me know if it works for you.
Regards,
Aadesh