It looks like each lap is counted twice (assuming that the pool length is set correctly). What about lengths count? Is that correct? There isn't much to analyze (Fitbit's swim tracking is the worst I have ever seen) to tell whether lap restarted at some point. I have seen it on Garmin watches when while swimming for some reason I had my stroke disturbed (ie. slower swimmer in front), then lap ended and started new one but that could be seen in laps breakdown (and on watch). With Fitbit you probably have to accept what you got. For me, that doesn't work too and I stopped tracking swimming with Sense 2.
