Hi @Jay-Encodian ,
I'm using Update file properties, not populate a word template as you see below:

Regarding the reason, here is where they got added into the document:
{
"@odata.etag": "\"5\"",
"ItemInternalId": "12",
"ID": 12,
"Title": "Business Case Approval Sheet.docx",
"Project_x0020_Name": "IRSP Towers",
"Reference_x0020_No": "23421",
"Dept": "DSA",
"Permenant_x0020_Committee_x0020_Members": [
{
"@odata.type": "#Microsoft.Azure.Connectors.SharePoint.SPListExpandedReference",
"Id": 0,
"Value": "CEO"
},
{
"@odata.type": "#Microsoft.Azure.Connectors.SharePoint.SPListExpandedReference",
"Id": 1,
"Value": "CSD Director"
},
{
"@odata.type": "#Microsoft.Azure.Connectors.SharePoint.SPListExpandedReference",
"Id": 2,
"Value": "CSSO"
},
{
"@odata.type": "#Microsoft.Azure.Connectors.SharePoint.SPListExpandedReference",
"Id": 3,
"Value": "CFO"
},
{
"@odata.type": "#Microsoft.Azure.Connectors.SharePoint.SPListExpandedReference",
"Id": 4,
"Value": "GRC Director"
},
{
"@odata.type": "#Microsoft.Azure.Connectors.SharePoint.SPListExpandedReference",
"Id": 5,
"Value": "SQE Director"
}
],
"Permenant_x0020_Committee_x0020_Members@odata.type": "#Collection(Microsoft.Azure.Connectors.SharePoint.SPListExpandedReference)",
"Permenant_x0020_Committee_x0020_Members#Id": [
0,
1,
2,
3,
4,
5
],
"Permenant_x0020_Committee_x0020_Members#Id@odata.type": "#Collection(Int64)",
"Additional_x0020_Permanent_x0020_Members_x0020_for_x0020_technical_x0020_projects": [
{
"@odata.type": "#Microsoft.Azure.Connectors.SharePoint.SPListExpandedReference",
"Id": 0,
"Value": "CTO"
},
{
"@odata.type": "#Microsoft.Azure.Connectors.SharePoint.SPListExpandedReference",
"Id": 1,
"Value": "COO"
}
],
"Additional_x0020_Permanent_x0020_Members_x0020_for_x0020_technical_x0020_projects@odata.type": "#Collection(Microsoft.Azure.Connectors.SharePoint.SPListExpandedReference)",
"Additional_x0020_Permanent_x0020_Members_x0020_for_x0020_technical_x0020_projects#Id": [
0,
1
],
"Additional_x0020_Permanent_x0020_Members_x0020_for_x0020_technical_x0020_projects#Id@odata.type": "#Collection(Int64)",
"Variable_x0020_Members": [
{
"@odata.type": "#Microsoft.Azure.Connectors.SharePoint.SPListExpandedReference",
"Id": 0,
"Value": "<Business Owner>"
},
{
"@odata.type": "#Microsoft.Azure.Connectors.SharePoint.SPListExpandedReference",
"Id": 1,
"Value": "<Technical Owner>"
}
],
"Variable_x0020_Members@odata.type": "#Collection(Microsoft.Azure.Connectors.SharePoint.SPListExpandedReference)",
"Variable_x0020_Members#Id": [
0,
1
],
"Variable_x0020_Members#Id@odata.type": "#Collection(Int64)",
"Modified": "2019-12-15T13:34:09Z",
"Editor": {
"@odata.type": "#Microsoft.Azure.Connectors.SharePoint.SPListExpandedUser",
"Claims": "i:0#.f|membership|mabalamri@sans.com.sa",
"DisplayName": "Mohammed A. Alamri",
"Email": "mabalamri@sans.com.sa",
"Picture": "https://sansksa.sharepoint.com/sites/Elibrary/General Documents/_layouts/15/UserPhoto.aspx?Size=L&AccountName=mabalamri@sans.com.sa",
"Department": "SED",
"JobTitle": "Analyses"
},
"Editor#Claims": "i:0#.f|membership|mabalamri@sans.com.sa",
"OData__dlc_DocId": "5A44CPU4C3JC-1838921421-12",
"OData__dlc_DocIdUrl": "https://sansksa.sharepoint.com/sites/Elibrary/General Documents/_layouts/15/DocIdRedir.aspx?ID=5A44CPU4C3JC-1838921421-12",
"Created": "2019-12-15T13:23:59Z",
"Author": {
"@odata.type": "#Microsoft.Azure.Connectors.SharePoint.SPListExpandedUser",
"Claims": "i:0#.f|membership|mabalamri@sans.com.sa",
"DisplayName": "Mohammed A. Alamri",
"Email": "mabalamri@sans.com.sa",
"Picture": "https://sansksa.sharepoint.com/sites/Elibrary/General Documents/_layouts/15/UserPhoto.aspx?Size=L&AccountName=mabalamri@sans.com.sa",
"Department": "SED",
"JobTitle": "Analyses"
},
"Author#Claims": "i:0#.f|membership|mabalamri@sans.com.sa",
"OData__DisplayName": "",
"{Identifier}": "Business%2bCase%2bApproval%2bSheets%252fBusiness%2bCase%2bApproval%2bSheet.docx",
"{IsFolder}": false,
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"{Link}": "https://sansksa.sharepoint.com/sites/Elibrary/General%20Documents/Business%20Case%20Approval%20Sheets/Business%20Case%20Approval%20Sheet.docx?d=w9a6dd9d9b34b4c8cb49f3b0ea208291e",
"{Name}": "Business Case Approval Sheet",
"{FilenameWithExtension}": "Business Case Approval Sheet.docx",
"{Path}": "Business Case Approval Sheets/",
"{ContentType}": {
"@odata.type": "#Microsoft.Azure.Connectors.SharePoint.SPListExpandedContentType",
"Id": "0x010100C93A16F808DF5D4681CE5D2025B0FED500AACFDEC68D7E6C48AD2A4AD3C5F525A6",
"Name": "BC Approval Sheet"
},
"{ContentType}#Id": "0x010100C93A16F808DF5D4681CE5D2025B0FED500AACFDEC68D7E6C48AD2A4AD3C5F525A6",
"{IsCheckedOut}": false,
"{VersionNumber}": "5.0"
}
