Hello @AASwim thanks for bringing this to my attention, it's a pleasure for me to assist you with the inconvenience experienced with your swim exercise. Welcome to the Community Forums!
Seems odd that your swim lengths are not being recorded accurately and the way we designed them, I totally understand how frustrating this matter can be for you and I'm sorry for that. If you haven't already done so, I recommend you to check all the information that's specified on: How do I track my swims with my Fitbit device? and take in consideration that information that's in here.
Let me know how it goes, I'll be around if you need further assistance.
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