Sometimes the metadata used to represent a change made in Salesforce doesn't quite line up with what the Salesforce UI would lead you to believe. An example of this is picklist values on standard fields; for instance, the values of the
Account Source field on the
Account standard object.
The Salesforce UI makes it look as if the field actually stores the value, but the reality is that the values are stored in another metadata type called a
Standard Value Set and the actual field definition for
Account Source is only a reference to the
Standard Value Set.
To find changes to your picklists, run a comparison that includes the
Standard Value Set,
Global Value Set and
Custom Object metadata types in a custom filter. You can then filter the Gearset result and find the changes you're interested in.