Welness Data (Weight and resting HR) copied from last record

It doesn’t! The value in settings never changes unless you change it manually. It’s only meant as a initial “startup” value. The value in settings is ONLY used if there is no value in the wellness data from a more recent date.
If you have no wellness data for today and performed an activity, the calculations are done with the most recent value in the wellness data.
If you have wellness data for today, it is NOT copied to the settings. You should not pay attention to values for RHR and Weight in the settings because they only were used for your very first activity, and even then, only if no other values were entered in the wellness fields after the time that you set them in the settings.
The weight and RHR used for the calculations can be found on the calendar page if you have it set visible or on the Wellness entry dialog.
On days without Wellness entries and without activities, those fields remain blank. If you perform an activity, they get the most recent values from your wellness records.

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