diff --git a/api/core/workflow/graph_engine/entities/graph.py b/api/core/workflow/graph_engine/entities/graph.py
index 6dcd0a52f8..16bf80f34a 100644
--- a/api/core/workflow/graph_engine/entities/graph.py
+++ b/api/core/workflow/graph_engine/entities/graph.py
@@ -174,6 +174,7 @@ class Graph(BaseModel):
         node_parallel_mapping: dict[str, str] = {}
         cls._recursively_add_parallels(
             edge_mapping=edge_mapping,
+            reverse_edge_mapping=reverse_edge_mapping,
             start_node_id=root_node_id,
             parallel_mapping=parallel_mapping,
             node_parallel_mapping=node_parallel_mapping
@@ -310,6 +311,7 @@ class Graph(BaseModel):
     @classmethod
     def _recursively_add_parallels(cls,
                                    edge_mapping: dict[str, list[GraphEdge]],
+                                   reverse_edge_mapping: dict[str, list[GraphEdge]],
                                    start_node_id: str,
                                    parallel_mapping: dict[str, GraphParallel],
                                    node_parallel_mapping: dict[str, str]) -> None:
@@ -365,6 +367,7 @@ class Graph(BaseModel):
 
                 in_branch_node_ids = cls._fetch_all_node_ids_in_parallels(
                     edge_mapping=edge_mapping,
+                    reverse_edge_mapping=reverse_edge_mapping,
                     parallel_branch_node_ids=parallel_branch_node_ids
                 )
 
@@ -412,6 +415,7 @@ class Graph(BaseModel):
         for graph_edge in target_node_edges:
             cls._recursively_add_parallels(
                 edge_mapping=edge_mapping,
+                reverse_edge_mapping=reverse_edge_mapping,
                 start_node_id=graph_edge.target_node_id,
                 parallel_mapping=parallel_mapping,
                 node_parallel_mapping=node_parallel_mapping
@@ -472,6 +476,7 @@ class Graph(BaseModel):
     @classmethod
     def _fetch_all_node_ids_in_parallels(cls,
                                          edge_mapping: dict[str, list[GraphEdge]],
+                                         reverse_edge_mapping: dict[str, list[GraphEdge]],
                                          parallel_branch_node_ids: list[str]) -> dict[str, list[str]]:
         """
         Fetch all node ids in parallels
@@ -499,7 +504,11 @@ class Graph(BaseModel):
                     leaf_node_ids[branch_node_id].append(node_id)
 
                 for branch_node_id2, inner_route2 in routes_node_ids.items():
-                    if branch_node_id != branch_node_id2 and node_id in inner_route2:
+                    if (
+                        branch_node_id != branch_node_id2 
+                        and node_id in inner_route2
+                        and len(reverse_edge_mapping.get(node_id, [])) > 1
+                    ):
                         if node_id not in merge_branch_node_ids:
                             merge_branch_node_ids[node_id] = []