What is causing a color shift in one scene?

I have a canvas with a collection of PNGs making a title screen. Somehow Unity is changing the colors of the sprites making up the scene. Below is a chart showing a sample original PNG, how it is darker in the Sprite Editor and Game views, and normal in the Scene view. It isn't happening in any of the other scenes in our project. For some reason pure white is unaffected. Is there some other setting I should look for, or a meta file I should delete or something? Thanks.