diff --git a/server/routes/request.test.ts b/server/routes/request.test.ts
index f41ed710e..2c88e8420 100644
--- a/server/routes/request.test.ts
+++ b/server/routes/request.test.ts
@@ -339,6 +339,75 @@ describe('PUT /request/:requestId (movie)', () => {
   });
 });
 
+describe('PUT /request/:requestId (tv)', () => {
+  it('does not add a season held by another request', async () => {
+    const userRepo = getRepository(User);
+    const mediaRepo = getRepository(Media);
+    const requestRepo = getRepository(MediaRequest);
+
+    const owner = await userRepo.findOneOrFail({
+      where: { email: 'admin@seerr.dev' },
+    });
+    const otherUser = await userRepo.findOneOrFail({
+      where: { email: 'friend@seerr.dev' },
+    });
+
+    const media = await mediaRepo.save(
+      new Media({
+        mediaType: MediaType.TV,
+        tmdbId: 67890,
+        status: MediaStatus.PENDING,
+        status4k: MediaStatus.UNKNOWN,
+      })
+    );
+
+    const seedTvRequest = (requestedBy: User, seasons: number[]) =>
+      requestRepo.save(
+        new MediaRequest({
+          type: MediaType.TV,
+          status: MediaRequestStatus.PENDING,
+          media,
+          requestedBy,
+          is4k: false,
+          seasons: seasons.map(
+            (seasonNumber) =>
+              new SeasonRequest({
+                seasonNumber,
+                status: MediaRequestStatus.PENDING,
+              })
+          ),
+        })
+      );
+
+    const mediaRequest = await seedTvRequest(owner, [1, 2]);
+    const otherRequest = await seedTvRequest(otherUser, [3]);
+
+    const agent = await loginAs('admin@seerr.dev', 'test1234');
+    const res = await agent.put(`/request/${mediaRequest.id}`).send({
+      mediaType: MediaType.TV,
+      seasons: [1, 2, 3],
+    });
+
+    assert.strictEqual(res.status, 200);
+
+    const saved = await requestRepo.findOneOrFail({
+      where: { id: mediaRequest.id },
+    });
+    assert.deepStrictEqual(
+      saved.seasons.map((s) => s.seasonNumber).sort((a, b) => a - b),
+      [1, 2]
+    );
+
+    const otherSaved = await requestRepo.findOneOrFail({
+      where: { id: otherRequest.id },
+    });
+    assert.deepStrictEqual(
+      otherSaved.seasons.map((s) => s.seasonNumber),
+      [3]
+    );
+  });
+});
+
 describe('POST /request/:requestId/:status', () => {
   const cases = [
     { action: 'approve', expected: MediaRequestStatus.APPROVED },
diff --git a/server/routes/request.ts b/server/routes/request.ts
index 871f23181..9ee569739 100644
--- a/server/routes/request.ts
+++ b/server/routes/request.ts
@@ -571,7 +571,7 @@ requestRoutes.put<{ requestId: string }>(
           });
         }
 
-        const newSeasons = requestedSeasons.filter(
+        const newSeasons = filteredSeasons.filter(
           (sn) => !request.seasons.map((s) => s.seasonNumber).includes(sn)
         );