diff --git a/apps/shaders_lab/shaders_lab.exe b/apps/shaders_lab/shaders_lab.exe
index 475f3557..f3e82dd3 100755
Binary files a/apps/shaders_lab/shaders_lab.exe and b/apps/shaders_lab/shaders_lab.exe differ
diff --git a/cpp/functions/gfx/dag_node_editor.cpp b/cpp/functions/gfx/dag_node_editor.cpp
index cf5a09ce..c57df7d7 100644
--- a/cpp/functions/gfx/dag_node_editor.cpp
+++ b/cpp/functions/gfx/dag_node_editor.cpp
@@ -7,6 +7,7 @@
 #include <queue>
 #include <string>
 #include <unordered_map>
+#include <unordered_set>
 #include <vector>
 
 namespace ed = ax::NodeEditor;
@@ -15,8 +16,9 @@ namespace fn::gfx {
 
 static constexpr int MAX_NODES = 16;
 
-static ed::EditorContext* s_ctx = nullptr;
-static uint32_t           s_next_uid = 1;
+static ed::EditorContext*         s_ctx = nullptr;
+static uint32_t                   s_next_uid = 1;
+static std::unordered_set<uint32_t> s_positioned;
 
 // ── ID encoding ──────────────────────────────────────────────────────────────
 // node id   = editor_uid
@@ -213,6 +215,18 @@ bool dag_node_editor(std::vector<DagStep>& pipeline) {
 
         ImVec4 col = kind_color(def->kind);
 
+        // Initial position only — after that, the editor owns the node's position
+        // and user drags must not be overwritten.
+        if (s_positioned.find(step.editor_uid) == s_positioned.end()) {
+            if (step.editor_pos_x == 0.0f && step.editor_pos_y == 0.0f) {
+                step.editor_pos_x = 50.0f + static_cast<float>(i) * 220.0f;
+                step.editor_pos_y = 100.0f;
+            }
+            ed::SetNodePosition(ed::NodeId(node_id(step.editor_uid)),
+                                ImVec2(step.editor_pos_x, step.editor_pos_y));
+            s_positioned.insert(step.editor_uid);
+        }
+
         ed::BeginNode(ed::NodeId(node_id(step.editor_uid)));
 
         // Header
@@ -272,14 +286,6 @@ bool dag_node_editor(std::vector<DagStep>& pipeline) {
         ed::EndPin();
 
         ed::EndNode();
-
-        // Set initial position if not yet placed (both zero = first time)
-        if (step.editor_pos_x == 0.0f && step.editor_pos_y == 0.0f) {
-            step.editor_pos_x = 50.0f + static_cast<float>(i) * 220.0f;
-            step.editor_pos_y = 100.0f;
-        }
-        ed::SetNodePosition(ed::NodeId(node_id(step.editor_uid)),
-                            ImVec2(step.editor_pos_x, step.editor_pos_y));
     }
 
     // ── Draw existing links ──────────────────────────────────────────────────