Battle Playback is not a recording of the battle; rather, it is a recreation of the battle based on stored game data.
For this reason, it is possible that there will be some small discrepancies between the outcome depicted in the Battle Playback and the outcome recorded in the Battle Log.
In these cases, the Battle Log outcome should be considered the authoritative version. The general series of events should still be fairly accurate and of great value when evaluating base design.