diff --git a/src/pages/RoomMembersPage.tsx b/src/pages/RoomMembersPage.tsx
index 514e1f462e6b..ce9bae168684 100644
--- a/src/pages/RoomMembersPage.tsx
+++ b/src/pages/RoomMembersPage.tsx
@@ -173,8 +173,13 @@ function RoomMembersPage({report, session, policies}: RoomMembersPageProps) {
 
         participants.forEach((accountID) => {
             const details = personalDetails[accountID];
+            // When adding a new member to a room (whose personal detail does not exist in Onyx), an optimistic personal detail
+            // is created. However, when the real personal detail is returned from the backend, a duplicate member may appear
+            // briefly before the optimistic personal detail is deleted. To address this, we filter out the optimistically created
+            // member here.
+            const isDuplicateOptimisticDetail = details?.isOptimisticPersonalDetail && participants.some((accID) => accID !== accountID && details.login === personalDetails[accID]?.login);
 
-            if (!details) {
+            if (!details || isDuplicateOptimisticDetail) {
                 Log.hmmm(`[RoomMembersPage] no personal details found for room member with accountID: ${accountID}`);
                 return;
             }