Some Google fonts print incorrectly on anisotropic RIPs

Does anyone have any insight into why some google fonts print distorted when a RIP using unequal resolutions? We have designers and laypersons sending in PDF's using free Google fonts for book production. Most of our work isn't proofed before printing so if the printer doesn't notice we potentially have a pallet of paper destined for the trash. This problem has only been apparent for the last couple of years and I have no way of knowing that the font is going to be a problem.
The printing device is a SCREEN Truepress jet520, the most productive resolution is 360dpi x 720dpi and google truetype fonts are the only problem fonts.