Issue fixed: The WebPart was working fine locally by fetching data from _getMockListData.

However, when I was trying test the WebPart on the https://MyOffice365.sharepoint.com/sites/**InCorrectSPSite**/_layouts/15/workbench.aspx

I later noticed that I was pointing to wrong SP-site.

Issue fixed: The WebPart was working fine locally by fetching data from _getMockListData.

However, it wasn't when I was trying to test the WebPart on the https://MyOffice365.sharepoint.com/sites/**InCorrectSPSite**/_layouts/15/workbench.aspx

I later noticed that I was pointing to wrong SP-site.