When I create line charts in Interface designer and group data by some criterion, the values are not visualized the same way as if I did not group the records. (Related chart setting enabled)
Can you provide a screenshot of an example of the underlying data? If you could provide a read-only invite link to a duplicated copy of your base with example data that would be help too! Without knowing how your base is set up or how you set up your chart it's difficult to help