4- point gradient not looking that smooth on Hitfilm express

I'm having issue with making the gradient background look good and smooth but I have no idea how to fix it if there even is a fix. I think it may be that my project only has 8-bit integer color bit depth but that's just as speculation This is the picture on my google drive .....

I'm fairly new to hitfilm express and admittedly haven't watched nearly enough videos to be anything but a novice video editor, so this could be something super easy to fix that I just don't know about. Any help would be nice


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