diff --git a/src/cleveragents/core/application.py b/src/cleveragents/core/application.py
index 864cbbcc..df80a55b 100644
--- a/src/cleveragents/core/application.py
+++ b/src/cleveragents/core/application.py
@@ -633,21 +633,10 @@ class ReactiveCleverAgentsApp:
                 self.stream_router.split_stream(source, targets)
                 self.logger.debug(f"Split stream {source} into {list(targets.keys())}")
 
-        # Re-setup subscriptions after all merges/splits to ensure proper connections
-        # Only check routes
-        all_stream_names = set()
-
-        # Add stream routes
-        for route_name, route_config in self.config.routes.items():
-            if route_config.type == RouteType.STREAM:
-                all_stream_names.add(route_name)
-
-        # Re-setup subscriptions
-        for stream_name in all_stream_names:
-            if stream_name in self.stream_router.stream_configs:
-                self.stream_router._setup_subscriptions(
-                    self.stream_router.stream_configs[stream_name]
-                )
+        # NOTE: Subscriptions are already set up in create_stream()
+        # Re-setting them here would create duplicates, causing double output
+        # Merge and split operations automatically handle stream connections
+        self.logger.debug("Stream operations setup completed - subscriptions already configured")
 
     # Removed _setup_langgraphs - use routes instead