diff --git a/cypress/e2e/consortia/marc/marc-bibliographic/edit-marc-bib/marc-bib-edit-in-central.cy.js b/cypress/e2e/consortia/marc/marc-bibliographic/edit-marc-bib/marc-bib-edit-in-central.cy.js
index c31818c543..c465e77cea 100644
--- a/cypress/e2e/consortia/marc/marc-bibliographic/edit-marc-bib/marc-bib-edit-in-central.cy.js
+++ b/cypress/e2e/consortia/marc/marc-bibliographic/edit-marc-bib/marc-bib-edit-in-central.cy.js
@@ -97,7 +97,7 @@ describe('MARC', () => {
           QuickMarcEditor.checkPaneheaderContains(testData.sharedPaneheaderText);
           QuickMarcEditor.updateExistingField(testData.tag245, testData.tag245UpdatedValue);
           QuickMarcEditor.updateExistingField(testData.tag500, testData.tag500UpdatedValue);
-          QuickMarcEditor.moveFieldUp(18);
+          QuickMarcEditor.moveFieldUp(17);
           QuickMarcEditor.pressSaveAndClose();
           QuickMarcEditor.checkAfterSaveAndClose();
           InventoryInstance.checkInstanceTitle(testData.updatedTitle);
@@ -114,10 +114,7 @@ describe('MARC', () => {
           InventoryInstances.searchByTitle(createdInstanceID);
           InventoryInstances.selectInstance();
           InventoryInstance.checkInstanceTitle(testData.updatedTitle);
-          InventoryInstance.verifyLastUpdatedSource(
-            users.userAProperties.firstName,
-            users.userAProperties.lastName,
-          );
+          InventoryInstance.verifyLastUpdatedSourceByUnknownUser();
           InventoryInstance.viewSource();
           InventoryViewSource.verifyFieldInMARCBibSource(
             testData.tag245,
@@ -135,8 +132,8 @@ describe('MARC', () => {
             users.userAProperties.firstName,
             users.userAProperties.lastName,
           );
-          QuickMarcEditor.verifyTagValue(17, testData.tag504);
-          QuickMarcEditor.verifyTagValue(18, testData.tag500);
+          QuickMarcEditor.verifyTagValue(16, testData.tag504);
+          QuickMarcEditor.verifyTagValue(17, testData.tag500);
         },
       );
     });
diff --git a/cypress/support/fragments/inventory/inventoryInstance.js b/cypress/support/fragments/inventory/inventoryInstance.js
index 6c9264b9f3..79ee165b10 100644
--- a/cypress/support/fragments/inventory/inventoryInstance.js
+++ b/cypress/support/fragments/inventory/inventoryInstance.js
@@ -1618,6 +1618,11 @@ export default {
       .should('include.text', `${userLastName}, ${userFirsttName}`);
   },
 
+  verifyLastUpdatedSourceByUnknownUser: () => {
+    cy.do(Accordion('Administrative data').click());
+    cy.get('div[data-test-updated-by="true"]').should('include.text', 'Unknown user');
+  },
+
   verifyRecordCreatedSource: (userFirsttName, userLastName) => {
     cy.get('div[data-test-created-by="true"]')
       .find('a')