This was a Salesforce change;
In the Spring ’17 release, they changed this behavior to protect your picklist integrations. From now on, each picklist value is represented with a label and an API name(similar to the name-value pair data representation):
- Picklist value’s label – displayed in a record through UI.
- Picklist value’s API name – used internally on metadata level.
Our only recommendation is to change the API name to the desired output.