When Elgato program is opened, game turns black and white

Im using a Elgato HD with the wii. I connected everything up correctly and it shows up in the correct resolution and has color. It’s completely fine until I open the Elgato Capture program. It turns everything black and white and I have messed with everything to try and get it to be color again. I re downloaded the program, tried every USB port on my computer, switched HDMI ports and cords, and unplugged and re plugged everything multiple times. Please help!