Symptoms
Customer is seeing the following method showing up twice under SharePoint 2013 Service Object.
“Upload Document Document Metadata By ID”
Diagnoses
The issue was caused by manually creating SharePoint 2013 Service Instance manually from SmartObject Service Tester.
Resolution
So the recommendation for you and you developer is to not creating SharePoint 2013 Service Instance and its’ SmartObject via SmartObject Service Tester Tool. This will cause unexpected behavior.