Screen Color Changes in MAC Pro (mid2010) since installing Sapphire Pulse RX 580 in prep for Mojave

I recently installed a Sapphire Pulse RX 580 8g Card into my MAC PRO (mid 2010) and now upgraded to Mojave only to find screen color with Dark Purple highlights. The color black now appears as redish purple. It affects depth perceptions and I have no was to bring back black into any screen colors. Anyone have experienced this or know a cure?