Group Tree Field Displays Multiple times

In my report I created a formula field that concatenates an ID field with a field name then I Grouped the report on that Formula.
I also have a prompt based on that ID field and the user can select more than 1 ID.
When they do select more than 1 ID the Group tree is out of order, scrambled and displays the ID and Field Name multiple Times.

What could cause this?

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p_b_bradley :ireland: (BOB member since 2006-03-15)