diff --git a/tests/analytical_visualization/app.py b/tests/analytical_visualization/app.py
index b151e3c..f08b983 100644
--- a/tests/analytical_visualization/app.py
+++ b/tests/analytical_visualization/app.py
@@ -19,12 +19,18 @@ import streamlit as st
 # keep using the pre-edit versions until a full Ctrl+C + restart. Force
 # a reload of our own modules on every rerun so signature changes land
 # without a full restart.
+# Order matters: model_config first because everything else imports from it
+# (e.g. TopologyConfig). If we reload downstream modules while model_config
+# is stale, they end up holding the OLD dataclass definition and every
+# `cfg.topo.new_field` lookup blows up with AttributeError.
 for _mod_name in (
+    "tests.analytical_visualization.model_config",
+    "tests.analytical_visualization.model_presets",
+    "tests.analytical_visualization.autosuggest",
+    "tests.analytical_visualization.memory_layout",
+    "tests.analytical_visualization.stage_latencies",
     "tests.analytical_visualization.auto_explore",
     "tests.analytical_visualization.auto_hardware",
-    "tests.analytical_visualization.autosuggest",
-    "tests.analytical_visualization.stage_latencies",
-    "tests.analytical_visualization.memory_layout",
     "tests.analytical_visualization.pe_weight_layout",
     "tests.analytical_visualization.tensor_sharding",
     "tests.analytical_visualization.topology_map",