[DerekM]

Open the utility drawer (View -> Show Utility Drawer) and in the lower section of it is the style palette. Select the 'All level 5 rows' entry and look at the Style Attribute inspector. This will list all the styles assigned to that group. It sounds like you have a color assigned to the level 5 grouping that you don't want. Click the 'x' to the right of the entry in the inspector to remove it.