A newly hand picked User-Defined Field takes first available position.
A field position in the list of User-Defined Fields is extremely important. If you delete a field in Settings by mistake, add it back immediately. If another field takes this position, all widgets will now reference a new field.
Current limit is 10 User-Defined Fields per module. Once the limit is reached, the +ADD button will be grayed out.
All changes made in Insights settings will be processed during the next sync. Please, allow up to 24 hours.