Have spotted a few of these across the various titles.
A repeat of the 8th New York at First Bull Run on the Antietam disk springs to mind. I know there are scenarios on Antietam where entire Reb Brigades are on the map twice!
I guess the Historical OOB's used as reference when creating the games sometimes list units that were reassigned during the campaign and it's easy to lose track of the repeat entries when designing scenarios.
Never known it to be too much of a problem though I did have to object when I found myself facing A Reb Brigade x 2 on a hypothetical Antietam scenario. I thought I was going crazy initially seeing a Brigade at one side of the map suddenly re-appear miles away on the other side.
