pls check below Community Blog very helpful.
With respect to Certification UI Display Name and Description we observed similar discrepancy on my production environment which was migrated from 7.1p6 to 8.4p2
But on Fresh installation of 8.4p2 displaying correctly.
From Debug Pages → UIConfig we need to refer the section uiCertificationItemWorksheetColumns*
<ColumnConfig dataIndex="displayName" evaluator="sailpoint.web.view.certification.CertificationItemDisplayNameColumn" groupProperty="type,bundle,exceptionApplication,exceptionAttributeName,exceptionAttributeValue,exceptionPermissionTarget,exceptionPermissionRight,violationSummary" headerKey="cert_item_tbl_header_display_name" hideable="true" percentWidth="20" property="IIQ_displayName" renderer="spCertificationDisplayNameColumn" secondarySort="parent.lastname,parent.firstname,type" sortProperty="type,bundle,exceptionApplication,exceptionAttributeName,exceptionAttributeValue,exceptionPermissionTarget,exceptionPermissionRight,violationSummary" sortable="true" stateId="displayName"/>
<ColumnConfig dataIndex="description" evaluator="sailpoint.web.view.certification.CertificationItemDescriptionColumn" groupProperty="IIQ_description" headerKey="cert_item_tbl_header_description" hideable="true" minWidth="250" percentWidth="50" property="IIQ_description" renderer="spMoreLessToggleColumn" sortProperty="IIQ_description" stateId="description"/>
My troubleshooting and findings regarding Description if there are no values mapped from or not rendered backend, it will end up showing Entitlement (Group), so please check Configuration – Schema
DisplayName will be a concatenation of all the entitlements associated with the identity plus on Group (schema name) at end.