Situation: You have a campaign setup with flight target, that is being delivered ahead of schedule eg being used in one day
Solution: The most common cause of this is the campaign type, being set to exclusive not standard. An exclusive campaign will aim to deliver its daily or flight targets as soon as possible. If possible, a flight target will deliver as soon as it can in total, so if pacing is needed then set a daily target, which will then deliver this target as soon as possible within that day.
For more balanced pacing, set as a Standard Campaign as this will allow the target to be spread over the flight.