How is the measure Story Point change calculated?
Measure Story Points change is based on issue change history and should be used together with the Time dimension.
“Story Points change” represents by how many story points value has increased or decreased compared to previous day, week, month or year according on what level of time members you have selected for the report. Note that all changes are summed up for the selected period, and some changes are positive numbers (increase), and some changes are negative (decrease).
Please see the field definition also in the documentation: Jira Software custom fields.
Zane / support@eazyBI.com