diff --git a/apps/web/e2e/storage.spec.ts b/apps/web/e2e/storage.spec.ts
index e315b19..ddd3365 100644
--- a/apps/web/e2e/storage.spec.ts
+++ b/apps/web/e2e/storage.spec.ts
@@ -180,6 +180,15 @@ test('a reserved slot shows the value the constructor put in it', async ({ page
   const reserved = grid.locator('[data-testid="storage-reference"]');
   await expect(reserved.nth(0)).toContainText('length = 1', { timeout: 60_000 });
   await expect(reserved.nth(1)).toContainText('"hi"');
+
+  // A single push touches two slots (the length it rewrites, plus the new
+  // element) but names only one derived entry — the length slot is the
+  // reserved slot itself, not a derived one, and must not be double-counted.
+  const historyRecord = grid
+    .locator('[data-testid="storage-record"]')
+    .filter({ hasText: 'history' });
+  await expect(historyRecord).toContainText('1 entry seen');
+  await expect(historyRecord).not.toContainText('2 entries seen');
 });
 
 test('the default source shows its reserved slots, then their values on deploy', async ({
diff --git a/apps/web/src/storage/StorageGrid.tsx b/apps/web/src/storage/StorageGrid.tsx
index a0e3663..1b42542 100644
--- a/apps/web/src/storage/StorageGrid.tsx
+++ b/apps/web/src/storage/StorageGrid.tsx
@@ -276,8 +276,11 @@ export function StorageGrid({
           // prose that used to live under "Not expanded".
           const head = row.segments[0];
           const referenceSpan = head?.kind === 'reference' ? head.span : null;
-          const derivedSeen =
-            referenceSpan === null ? 0 : (runtime?.derivedCountByBase.get(referenceSpan.path) ?? 0);
+          // The same count that drives the child rows below, so the chip and
+          // the rows can never disagree. Counting resolutions by baseVariable
+          // instead double-counted a dynamic array's own length slot (read on
+          // entry, written on exit) as if it were a second entry.
+          const derivedSeen = children.length;
           const recordCells = row.segments
             .filter((segment) => segment.kind === 'value')
             .map((segment) => (segment as Extract<RowSegment, { kind: 'value' }>).cell)
diff --git a/apps/web/src/storage/runtimeView.test.ts b/apps/web/src/storage/runtimeView.test.ts
index 8d63e43..70c9e44 100644
--- a/apps/web/src/storage/runtimeView.test.ts
+++ b/apps/web/src/storage/runtimeView.test.ts
@@ -1,4 +1,4 @@
-import type { SemanticResolution, StorageAccessObservation } from '@slotscope/domain';
+import type { StorageAccessObservation } from '@slotscope/domain';
 import { describe, expect, it } from 'vitest';
 import { buildRuntimeView } from './runtimeView';
 
@@ -17,28 +17,10 @@ function trace(storage: StorageAccessObservation[]) {
   return { observations: { keccak: [], storage } };
 }
 
-function resolution(partial: Partial<SemanticResolution>): SemanticResolution {
-  return {
-    accessId: 'step-0',
-    stepIndex: 0,
-    kind: 'sstore',
-    status: 'exact',
-    label: null,
-    decodedValues: [],
-    reasoning: [],
-    baseVariable: null,
-    accessCostNote: null,
-    migration: null,
-    previousValueHex: null,
-    ...partial,
-  };
-}
-
 describe('buildRuntimeView', () => {
   it('is empty without a trace', () => {
     const view = buildRuntimeView(null, [], 0);
     expect(view.wordsBySlot.size).toBe(0);
-    expect(view.derivedCountByBase.size).toBe(0);
   });
 
   it('keys words by decimal slot and lets the last observation win', () => {
@@ -79,21 +61,6 @@ describe('buildRuntimeView', () => {
     );
     expect(view.wordsBySlot.get('1')).toBe(`${'0'.repeat(63)}4`);
   });
-
-  it('counts distinct derived entries per base variable', () => {
-    const view = buildRuntimeView(
-      trace([]),
-      [
-        resolution({ baseVariable: 'balances', label: 'balances[0x01]' }),
-        resolution({ baseVariable: 'balances', label: 'balances[0x01]' }),
-        resolution({ baseVariable: 'balances', label: 'balances[0x02]' }),
-        resolution({ baseVariable: null, label: 'raw' }),
-      ],
-      9,
-    );
-    expect(view.derivedCountByBase.get('balances')).toBe(2);
-    expect(view.derivedCountByBase.has('raw')).toBe(false);
-  });
 });
 
 describe('address-space filter (v1.5)', () => {
diff --git a/apps/web/src/storage/runtimeView.ts b/apps/web/src/storage/runtimeView.ts
index 4c9987e..cd63057 100644
--- a/apps/web/src/storage/runtimeView.ts
+++ b/apps/web/src/storage/runtimeView.ts
@@ -3,8 +3,6 @@ import type { SemanticResolution, TraceObservations } from '@slotscope/domain';
 export interface StorageRuntimeView {
   /** Decimal slot → the last 32-byte word observed at or before the cursor. */
   readonly wordsBySlot: ReadonlyMap<string, string>;
-  /** Base variable → how many distinct derived entries this run has named. */
-  readonly derivedCountByBase: ReadonlyMap<string, number>;
   /** Raw Layer-1 facts, so the grid can reconstruct derived slots itself. It
    * needs the declared-slot set to do that, which only the grid knows. */
   readonly observations: TraceObservations | null;
@@ -13,7 +11,6 @@ export interface StorageRuntimeView {
 
 const EMPTY: StorageRuntimeView = {
   wordsBySlot: new Map(),
-  derivedCountByBase: new Map(),
   observations: null,
   resolutions: [],
 };
@@ -56,16 +53,5 @@ export function buildRuntimeView(
     }
   }
 
-  const derivedLabels = new Map<string, Set<string>>();
-  for (const resolution of resolutions) {
-    const base = resolution.baseVariable;
-    if (base === null) continue;
-    const labels = derivedLabels.get(base) ?? new Set<string>();
-    labels.add(resolution.label ?? resolution.accessId);
-    derivedLabels.set(base, labels);
-  }
-  const derivedCountByBase = new Map<string, number>();
-  for (const [base, labels] of derivedLabels) derivedCountByBase.set(base, labels.size);
-
-  return { wordsBySlot, derivedCountByBase, observations, resolutions };
+  return { wordsBySlot, observations, resolutions };
 }