diff --git a/runner/e2e/all-demos.spec.ts b/runner/e2e/all-demos.spec.ts
index d53b31ff..9eee9187 100644
--- a/runner/e2e/all-demos.spec.ts
+++ b/runner/e2e/all-demos.spec.ts
@@ -195,6 +195,22 @@ test("the owner filter shows one person's demos, and the view is a link", async
   await expect(page).not.toHaveURL(/owner=/);
 });
 
+test("a pasted filter link filters regardless of its case", async ({ page }) => {
+  // The URL is the shareable artefact, and pasted links arrive hand-edited or
+  // autocapitalised. The slug has to match case-insensitively end to end: the
+  // grid filters AND the picker names the person — a filtered grid under an
+  // "Everyone" label would read as the whole team having two demos.
+  await stubShell(page);
+  await signIn(page);
+  await stubDemos(page);
+  await page.goto("/all-demos?owner=SOMEONE.ELSE");
+
+  await expect(card(page, "Their grid")).toBeVisible();
+  await expect(card(page, "Their second grid")).toBeVisible();
+  await expect(card(page, "My grid")).toHaveCount(0);
+  await expect(page.getByRole("button", { name: "Filter demos by owner" })).toContainText("Someone Else (2)");
+});
+
 test("a filter that matches nobody says whose it was", async ({ page }) => {
   await stubShell(page);
   await signIn(page);
diff --git a/runner/pipeline/demo-owners.test.mjs b/runner/pipeline/demo-owners.test.mjs
index 195ce54c..4ff0184c 100644
--- a/runner/pipeline/demo-owners.test.mjs
+++ b/runner/pipeline/demo-owners.test.mjs
@@ -72,6 +72,18 @@ test("a row with no owner is counted in the total but gets no option", () => {
   assert.deepEqual(options.slice(1).map((o) => o.value), ["dev"]);
 });
 
+test("two casings of one address are one owner, not two", () => {
+  // `created_by` has two writers (DEV-2501): the browser stores the broker's
+  // casing, the MCP path a normalised one. Options keyed on the raw value would
+  // list the same person twice, each with half their demos.
+  const options = ownerOptions(
+    [demo("Dev@Handsontable.com", "a"), demo("dev@handsontable.com", "b")],
+    displayNameFromEmail,
+  );
+  assert.deepEqual(options.map((o) => o.label), ["Everyone (2)", "Dev (2)"]);
+  assert.equal(options[1].value, "dev");
+});
+
 test("filtering matches on the slug, case-insensitively", () => {
   assert.deepEqual(filterByOwner(LIST, "marek.martuszewski").map((d) => d.id), ["a", "c", "e"]);
   assert.deepEqual(filterByOwner(LIST, "MAREK.MARTUSZEWSKI").map((d) => d.id), ["a", "c", "e"]);