Can anybody help please as my distance swam seems to constantly say 2km regardless of time & length swam. For example in March I swam for 40mins in a 25m pool, swimming 62 lengths & apparent distance 2km. Today I swam for 1hr in the same pool, swimming 92 lengths & again 2km. I know people have had number of lengths out but has anybody experienced this. Pool size is accurately set up on both swims.