Problems with Image and Table Borders when Converting Word 2016 to PDF

I have seen similar posts on this subject, but no definitive answer. Here is a summary of what I am experiencing:

I have installed Adobe Acrobat Pro DC (version 2018.011.20040) on my laptop in order to convert Microsoft Word documents (Word 2016 in the Office 365 suite) into customer-ready PDFs. The file type is .DOCX.

No matter how I create my PDF, some or many images are missing borders and my table has borders of various widths. These issues occur at 100%, 150%, 200%, and 50%.

Here are the specific options I tried and the results:

Option #1: Create PDF if Adobe Acrobat Pro DC

Advanced Settings: High Quality and 300 DPI for resolution

Results: one missing image border/table borders of varying widths

Option #2: Create PDF in Word 2016 (File > Print)

Choose Adobe PDF as printer

Printer Properties: High Quality and 300 DPI for resolution

Results: No PDF file error

Option #3: Create PDF in Word 2016 (File > Save Adobe PDF File As)

No advanced options to select

Results: same as option #1 but even more images missing borders

Option #4:  Create PDF in Word 2016 (File > Save As)

Chose .pdf as output

Under Options > Tools >Compress Pictures: selected HD (330)

Results: footers have black background/table borders are OK/some missing image borders

Any solutions would be greatly appreciated. Thank you.