CanvasGroup alpha reacts differently in Game than it does in Scene

I'm working on a 2d game and I have a parent object with the CanvasGroup component on it. When I change the alpha value to 0 in the Scene view then it does what I would expect, make the object invisible. When I change it in the Game view, only certain children of the parent are affected. All the children are an 'Image' and I don't know why only some are affected. And even at that, the children aren't as transparent in the Game view as it was in the Scene view. Any idea why?

 

Do you useuse the standard material for all images?

Do you use gamma color space (default) oror linear color space for your game?

 

I think that I do.

It is set to gamma and I tested it with linear and the problem is still there