Hi there, Houston.
To clarify, when you mentioned the "phantom budget class" are you referring to a deleted class or those amounts under the not specified column? Any details you can add are helpful to me to ensure we're on the same page.
Additionally, may I ask for additional information about the phantom amount you're referring to? Is it made by a journal entry process? If possible, could you add a screenshot so I can further review the budget report on my end and provide you with a timely solution.
Please keep me posted. Have a good one.