Do you mean the word 'Solid' for Gradient Type? Click on it and you'll understand what that means. It does not mean that you'll apply a solid color, but that the color of the gradient is smooth. The alternative is to add a bit of noise, to avoid banding.
If you do not like that you can use the gradient Palette delete all the groups. Load the old legacy group and move all the gradient out of the folders an delete the empty folder own your gradient palette