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Pool swim is not accurate

I have been using the 6pro to tack my swims

and constantly getting incorrect measurements.
I swim in a 50m pool for every 1km or 20 laps it records 22 laps and 1100m

Over 1km it completely starts to lose it and starts to add laps randomly 

it’s even worse in a 25m pool

what can be done to calibrate for accurate measurements