diff --git a/src/pages/GroupJoinPage.tsx b/src/pages/GroupJoinPage.tsx
index cc56fa4..3234163 100644
--- a/src/pages/GroupJoinPage.tsx
+++ b/src/pages/GroupJoinPage.tsx
@@ -41,6 +41,13 @@ const GroupJoinPage = () => {
       const groupId = searchParams.get('groupId');
       const inviter = searchParams.get('inviterName') || 'Someone';
       
+      // Debug logging
+      console.log('GroupJoinPage - URL Parameters:', {
+        groupId,
+        inviter,
+        allParams: Object.fromEntries(searchParams.entries())
+      });
+      
       setInviterName(inviter);
       
       if (groupId) {
diff --git a/src/pages/InvitationPage.tsx b/src/pages/InvitationPage.tsx
index 6b4016d..c9824b7 100644
--- a/src/pages/InvitationPage.tsx
+++ b/src/pages/InvitationPage.tsx
@@ -32,6 +32,7 @@ import {
 import { QRCodeSVG } from 'qrcode.react';
 import { dataService } from '../services/dataService';
 import type { Group } from '../types/group';
+import type { Contact } from '../types/contact';
 
 const InvitationPage = () => {
   const [invitationUrl, setInvitationUrl] = useState('');
@@ -62,6 +63,23 @@ const InvitationPage = () => {
         inviterName: inviterName || undefined,
         relationshipType: relationshipType || undefined,
       });
+
+      // Auto-detect if invitee is an existing member by checking contacts
+      if (inviteeName) {
+        try {
+          const contacts: Contact[] = await dataService.getContacts();
+          const isExistingContact = contacts.some(contact => 
+            contact.name.toLowerCase() === inviteeName.toLowerCase()
+          );
+          
+          if (isExistingContact) {
+            console.log(`Auto-detected ${inviteeName} as existing member`);
+            setIsExistingMember(true);
+          }
+        } catch (error) {
+          console.error('Failed to check contacts:', error);
+        }
+      }
       
       if (groupId) {
         setIsGroupInvite(true);
diff --git a/src/pages/SocialContractPage.tsx b/src/pages/SocialContractPage.tsx
index ce5c0bd..c999065 100644
--- a/src/pages/SocialContractPage.tsx
+++ b/src/pages/SocialContractPage.tsx
@@ -50,8 +50,17 @@ const SocialContractPage = () => {
       const inviteId = searchParams.get('invite');
       const existingMember = searchParams.get('existingMember') === 'true';
       
+      // Debug logging
+      console.log('SocialContract - URL Parameters:', {
+        groupId,
+        inviteId,
+        existingMember,
+        allParams: Object.fromEntries(searchParams.entries())
+      });
+      
       // If this is for an existing member and it's a group invite, redirect to group join page
       if (existingMember && groupId) {
+        console.log('Redirecting existing member to GroupJoinPage');
         const joinParams = new URLSearchParams(searchParams);
         navigate(`/join-group?${joinParams.toString()}`);
         return;