diff --git a/src/lib/validations/__tests__/source-priority.test.ts b/src/lib/validations/__tests__/source-priority.test.ts
index 555e60483..2ec68be46 100644
--- a/src/lib/validations/__tests__/source-priority.test.ts
+++ b/src/lib/validations/__tests__/source-priority.test.ts
@@ -266,8 +266,16 @@ describe("parseSourcePriority", () => {
       weight: ["MANUAL", "WITHINGS"] as const,
     };
     const out = parseSourcePriority(partial);
-    expect(out.weight).toEqual(["MANUAL", "WITHINGS"]);
-    expect(out.metricPriority.weight).toEqual(["MANUAL", "WITHINGS"]);
+    // v1.16.11 — the stored order leads; default-ladder sources the
+    // stored array lacks append after it (reconciliation).
+    expect(out.weight.slice(0, 2)).toEqual(["MANUAL", "WITHINGS"]);
+    expect(out.metricPriority.weight.slice(0, 2)).toEqual([
+      "MANUAL",
+      "WITHINGS",
+    ]);
+    for (const source of DEFAULT_SOURCE_PRIORITY.weight) {
+      expect(out.weight).toContain(source);
+    }
     // Other keys keep their defaults.
     expect(out.steps).toEqual(DEFAULT_SOURCE_PRIORITY.steps);
     expect(out.bloodPressure).toEqual(DEFAULT_SOURCE_PRIORITY.bloodPressure);
@@ -281,8 +289,14 @@ describe("parseSourcePriority", () => {
       },
     };
     const out = parseSourcePriority(partial);
-    expect(out.metricPriority.weight).toEqual(["MANUAL", "APPLE_HEALTH"]);
-    expect(out.metricPriority.steps).toEqual(["WITHINGS"]);
+    expect(out.metricPriority.weight.slice(0, 2)).toEqual([
+      "MANUAL",
+      "APPLE_HEALTH",
+    ]);
+    expect(out.metricPriority.steps[0]).toBe("WITHINGS");
+    for (const source of DEFAULT_SOURCE_PRIORITY.steps) {
+      expect(out.metricPriority.steps).toContain(source);
+    }
     // Unchanged metrics keep the constant default.
     expect(out.metricPriority.bloodPressure).toEqual(
       DEFAULT_SOURCE_PRIORITY.bloodPressure,
@@ -298,8 +312,11 @@ describe("parseSourcePriority", () => {
         weight: ["MANUAL", "WITHINGS"],
       },
     });
-    expect(out.weight).toEqual(["MANUAL", "WITHINGS"]);
-    expect(out.metricPriority.weight).toEqual(["MANUAL", "WITHINGS"]);
+    expect(out.weight.slice(0, 2)).toEqual(["MANUAL", "WITHINGS"]);
+    expect(out.metricPriority.weight.slice(0, 2)).toEqual([
+      "MANUAL",
+      "WITHINGS",
+    ]);
   });
 
   it("surfaces `deviceTypePriority` round-trip unchanged", () => {
@@ -319,7 +336,10 @@ describe("parseSourcePriority", () => {
       weight: ["MANUAL", "APPLE_HEALTH"] as const,
     };
     const out = parseSourcePriority(input);
-    expect(out.weight).toEqual(["MANUAL", "APPLE_HEALTH"]);
+    expect(out.weight.slice(0, 2)).toEqual(["MANUAL", "APPLE_HEALTH"]);
+    for (const source of DEFAULT_SOURCE_PRIORITY.weight) {
+      expect(out.weight).toContain(source);
+    }
   });
 });
 
@@ -351,7 +371,7 @@ describe("getSourceLadder + getDeviceTypeLadder helpers", () => {
     const resolved = parseSourcePriority({
       metricPriority: { weight: ["MANUAL"] },
     });
-    expect(getSourceLadder(resolved, "weight")).toEqual(["MANUAL"]);
+    expect(getSourceLadder(resolved, "weight")[0]).toBe("MANUAL");
     expect(getSourceLadder(resolved, "bloodPressure")).toEqual(
       DEFAULT_SOURCE_PRIORITY.bloodPressure,
     );
@@ -389,3 +409,51 @@ describe("getSourceLadder + getDeviceTypeLadder helpers", () => {
     );
   });
 });
+
+describe("parseSourcePriority — stored-ladder reconciliation (v1.16.11)", () => {
+  // A ladder saved before a source existed used to hide that source
+  // forever: the stored array replaced the default wholesale, the
+  // settings UI offers reorder but not add, and the picker ranked the
+  // invisible source last. The resolver now appends default-ladder
+  // sources missing from the stored ladder AFTER the user's explicit
+  // order — visible, reorderable, same effective rank as before.
+  it("appends sources the default ladder gained after the user saved", () => {
+    // A pre-v1.11 sleep ladder: no WHOOP, no FITBIT.
+    const resolved = parseSourcePriority({
+      metricPriority: {
+        sleep: ["APPLE_HEALTH", "MANUAL", "WITHINGS", "IMPORT"],
+      },
+    });
+    expect(resolved.metricPriority.sleep.slice(0, 4)).toEqual([
+      "APPLE_HEALTH",
+      "MANUAL",
+      "WITHINGS",
+      "IMPORT",
+    ]);
+    // Appended in default-ladder order, after the stored entries.
+    expect(resolved.metricPriority.sleep).toContain("WHOOP");
+    expect(resolved.metricPriority.sleep).toContain("FITBIT");
+    expect(resolved.metricPriority.sleep.indexOf("WHOOP")).toBeGreaterThan(3);
+    expect(
+      resolved.metricPriority.sleep.indexOf("WHOOP"),
+    ).toBeLessThan(resolved.metricPriority.sleep.indexOf("FITBIT"));
+  });
+
+  it("leaves a complete stored ladder byte-identical", () => {
+    const full = [...DEFAULT_SOURCE_PRIORITY.sleep].reverse();
+    const resolved = parseSourcePriority({
+      metricPriority: { sleep: full },
+    });
+    expect(resolved.metricPriority.sleep).toEqual(full);
+  });
+
+  it("keeps stored entries the default ladder does not know", () => {
+    const resolved = parseSourcePriority({
+      metricPriority: { sleep: ["MANUAL", "WHOOP"] },
+    });
+    expect(resolved.metricPriority.sleep[0]).toBe("MANUAL");
+    expect(resolved.metricPriority.sleep[1]).toBe("WHOOP");
+    expect(resolved.metricPriority.sleep).toContain("APPLE_HEALTH");
+    expect(resolved.metricPriority.sleep).toContain("WITHINGS");
+  });
+});
diff --git a/src/lib/validations/source-priority.ts b/src/lib/validations/source-priority.ts
index 0ef2c6df0..9a9b14de5 100644
--- a/src/lib/validations/source-priority.ts
+++ b/src/lib/validations/source-priority.ts
@@ -344,11 +344,29 @@ function buildResolved(
   deviceTypePriority: DeviceTypePriority,
 ): ResolvedSourcePriority {
   // Merge: defaults < flat (W5e) < nested (W8c).
-  const merged: Required<MetricPriority> = {
+  const replaced: Required<MetricPriority> = {
     ...DEFAULT_SOURCE_PRIORITY,
     ...flat,
     ...nested,
   };
+  // v1.16.11 — reconcile every stored ladder against the metric's
+  // default ladder. A stored ladder used to REPLACE the default
+  // wholesale, so a source integrated after the user last saved
+  // (WHOOP on a pre-v1.11 sleep ladder, Fitbit on pre-v1.12 ones)
+  // never surfaced again: the settings UI renders only the stored
+  // array and offers reorder, not add, and the picker ranked the
+  // invisible source last. The user's explicit order stays untouched;
+  // sources the default ladder knows and the stored ladder lacks
+  // append at the end — visible, reorderable, and ranked exactly where
+  // the old behaviour ranked them (after everything ranked).
+  const merged = {} as Required<MetricPriority>;
+  for (const key of Object.keys(replaced) as (keyof MetricPriority)[]) {
+    const stored = replaced[key];
+    const missing = DEFAULT_SOURCE_PRIORITY[key].filter(
+      (source) => !stored.includes(source),
+    );
+    merged[key] = missing.length > 0 ? [...stored, ...missing] : stored;
+  }
   const resolved: ResolvedSourcePriority = {
     ...merged,
     metricPriority: merged,