diff --git a/lib/reference-db.sh b/lib/reference-db.sh
index a45026c..aa8ed13 100755
--- a/lib/reference-db.sh
+++ b/lib/reference-db.sh
@@ -402,27 +402,32 @@ build_domains_section() {
                 # Also add aliases as separate entries
                 if [ -n "$server_alias" ]; then
                     # Convert space-separated aliases to newline-separated for safe iteration
-                    echo "$server_alias" | tr ' ' '\n' | while IFS= read -r alias; do
+                    # Use here-document instead of pipe to avoid subshell
+                    while IFS= read -r alias; do
                         [ -z "$alias" ] && continue
                         [ -n "${seen_domains[$alias]:-}" ] && continue
 
                         # Alias points to same document root and logs (inherit status from parent)
                         echo "DOMAIN|$alias|$user|$doc_root|$log_path|$php_version|no|alias|$domain|$http_code|$https_code|alias_of_$status_summary" >> "$SYSREF_DB"
                         seen_domains["$alias"]=1
-                    done
+                    done <<< "$(echo "$server_alias" | tr ' ' '\n')"
                 fi
             done
         else
             # Fallback for non-cPanel or if userdata not available
-            local primary_domain=$(get_user_domains "$user" | head -1)
+            local user_domains=$(get_user_domains "$user")
+            local primary_domain=$(echo "$user_domains" | head -1)
 
-            # Use while read to safely iterate over domains (handles spaces)
-            get_user_domains "$user" | while IFS= read -r domain; do
+            # Use here-document instead of pipe to avoid subshell (allows seen_domains updates to persist)
+            while IFS= read -r domain; do
                 [ -z "$domain" ] && continue
                 [ -n "${seen_domains[$domain]:-}" ] && continue
 
                 local is_primary="no"
-                [ "$domain" = "$primary_domain" ] && is_primary="yes"
+                # Only mark as primary if primary_domain is not empty AND matches
+                if [ -n "$primary_domain" ] && [ "$domain" = "$primary_domain" ]; then
+                    is_primary="yes"
+                fi
 
                 # Find log path
                 local log_path="${SYS_LOG_DIR}/${domain}"
@@ -437,7 +442,7 @@ build_domains_section() {
                 # Simple format for non-cPanel (with status codes)
                 echo "DOMAIN|$domain|$user||$log_path||$is_primary|local||$http_code|$https_code|$status_summary" >> "$SYSREF_DB"
                 seen_domains["$domain"]=1
-            done
+            done <<< "$user_domains"
         fi
     done