NTFS permissions changed on 2008 R2 File server when File is modified by MAC

Hello all,

  I am having an issue with files on my 2008 R2 file server.  From what I can tell the issue is that the NTFS permissions are being changed when a file is accessed by a mac and modified.  This seems to be completely random but this would be an example.

NTFS Permission for File A before accessed by MAC:   design                M                      After file modified by MAC                         Design                   M

                                                                              Domain admins  FC                                                                                  Domain Admins      FC

                                                                              photography       M 

                                                                              temps                R

When I see this happen I can go in and change the NTFS Permissions for Design or Domain Admins after the file has been modified and the permissions will revert back to how the permission were before they were modified by the MAC.  Anyone have any idea how to fix this?  The MAC's are AD integrated.