navigator

I’m fairly new to React Native, but I have a simple working app with three scenes. I was previously using Navigator but it felt laggy and was excited to try out React Navigation (as in https://reactnavigation.org/). After implementing React Navigation, my background color switched from white to grey, and what was grey to white. This is a strange and shouldn’t be related. However I didn’t change my styles. I only implemented the new navigation and the colors changed. When I revert back to Navigator my colors return. I’m using StackNavigator. Has anyone else encountered this strange phenomenon?