Carriers occasionally publish an actual arrival or departure and retract it later the same day.
Dockflow records what was received at the time, so a value can appear, then change back.
If a date looks like it moved backwards, this is usually why.
Example
A carrier publishes an actual arrival for a shipment, then withdraws it later. Dockflow records what was received at the time, so the arrival appears and then changes back. If the date looks like it moved backwards, this is usually why.