For instances of it happening after 2018 (because Ame has had me do this for certain characters between then and now), I'm just reasoning that the promotion realistically happened once for the character but that separate orders for each promotion step were sent from the ship to SA-PERSCOM with the first rank backdated. Typical clerical maneuvering stuff.
Now that Ame knows it shouldn't happen again.
Now that Ame knows it shouldn't happen again.