Charge 3 swim information inaccurate

[Bali-Ad]

I go to swim in a 25m pool and i set up in the Fitbit:

• Poollength 25 m
• Time 45 minutes. (i did 50 minutes)
• I count the tracks of 25 m manually.
• 40 tracks is 1000 m

Why after synchronising my I-phone tell me:

• 1775 m total??? (it has to be 1000m)
• 71 tracks??? (it has to be 40)

Today in the same pool and the same settings in Charge 3:

• I did 40 tracks count manually is 1000m.
• Why i phone said this time: 1425m in 57 tracks?
• Why different with last time: 1775m in 71 tracks?
• Same tracks, same distance, same time: 40 tracks in 50 minutes.

What is wrong, help me please.

Moderator edit: subject for clarity

[AlejandraFitbit]

Welcome to the Community, @Bali-Ad.

Thanks for the information provided. Inconsistencies in your swim data may be caused by any of the following:

• You completed only a few laps
• You stopped to rest multiple times or in the middle of the pool
• You stopped to rest for longer than 60 seconds after completing a pool length
• You changed your stroke type midway through a length
• You swam with a kickboard or without using your arms
• You swam less than the minimum duration needed for your swim to be automatically recognized

Let me know the outcome. 🙂