You've likely seen these too, but there are some suggestions about clearing the colors
and of resetting the workbook level formatting:
Re: Default label font colors has mind of its own (different post in the same thread)
Would it be possible to post a mock up of your workbook with fake data?
I wasn't able to recreate the problem in a simplistic example in Superstore.
284321color.twbx 1.2 MB