Do you know why my PDF's are not printing as they appear in print preview

Background:

I have 3 computers; two laptops (1 with Windows 7 Professional - 64bit and 1 with Windows XP - 32bit ) and one desktop (windows 10). They each have an Adobe Reader. In the same order: Laptop 1 has Acrobat DC, Laptop 2 has Acrobat X, and the Desktop has Acrobat XI.

The laptops both print wireless to a Brother MFC-9970CDW, the desktop is connected via USB.

The Issue:

Just recently, the two laptops started printing PDF documents poorly.  The image prints, but it is heavily shaded with grey - especially around letters and colors.  The desktop prints everything exactly as it should. All three computers print Microsoft Word and Excel documents without any issue.

I have tried disabling and enabling new TCP/IP ports without success.  I have also tried restoring to the previous version of Acrobat without success.  I have also tried updating drivers without success.  I have also tried "Printing As Image" ... without success.

As of this point, I have had no luck.

Please help if you have any suggestions.

Thank you,

Jason