diff --git a/src/hipscat_import/catalog/map_reduce.py b/src/hipscat_import/catalog/map_reduce.py
index 1fff4eff..ec4a6003 100644
--- a/src/hipscat_import/catalog/map_reduce.py
+++ b/src/hipscat_import/catalog/map_reduce.py
@@ -173,7 +173,7 @@ def split_pixels(
             pixel_dir = _get_pixel_directory(cache_shard_path, order, pixel)
             file_io.make_directory(pixel_dir, exist_ok=True)
             output_file = file_io.append_paths_to_pointer(
-                pixel_dir, f"shard_{splitting_key}_{chunk_number}.parquet"
+                pixel_dir, f"shard_{splitting_key}_{chunk_number}_{unique_index}.parquet"
             )
             if _has_named_index(filtered_data):
                 filtered_data.to_parquet(output_file, index=True)
diff --git a/tests/hipscat_import/catalog/test_map_reduce.py b/tests/hipscat_import/catalog/test_map_reduce.py
index edfe4d70..a327381c 100644
--- a/tests/hipscat_import/catalog/test_map_reduce.py
+++ b/tests/hipscat_import/catalog/test_map_reduce.py
@@ -264,13 +264,40 @@ def test_split_pixels_headers(formats_headers_csv, assert_parquet_file_ids, tmp_
         alignment=alignment,
     )
 
-    file_name = os.path.join(tmp_path, "order_0", "dir_0", "pixel_11", "shard_0_0.parquet")
+    file_name = os.path.join(tmp_path, "order_0", "dir_0", "pixel_11", "shard_0_0_0.parquet")
     expected_ids = [*range(700, 708)]
     assert_parquet_file_ids(file_name, "object_id", expected_ids)
 
-    file_name = os.path.join(tmp_path, "order_0", "dir_0", "pixel_1", "shard_0_0.parquet")
+    file_name = os.path.join(tmp_path, "order_0", "dir_0", "pixel_1", "shard_0_0_0.parquet")
     assert not os.path.exists(file_name)
 
+def test_split_pixels_same_destination(same_destination_csv, tmp_path):
+    """Test splitting a file where data points fall in different high order pixels
+    but have the same destination pixel."""
+    os.makedirs(os.path.join(tmp_path, "splitting"))
+    alignment = np.full(hp.nside2npix(2**10), None)
+    alignment[1306154] = (4, 318, 1)
+    alignment[1305941] = (4, 318, 2)
+    mr.split_pixels(
+        input_file=same_destination_csv,
+        file_reader=get_file_reader("csv"),
+        highest_order=10,
+        ra_column="CatWISE_RA",
+        dec_column="CatWISE_Dec",
+        splitting_key="0",
+        cache_shard_path=tmp_path,
+        resume_path=tmp_path,
+        alignment=alignment
+    )
+
+    file_name1 = os.path.join(tmp_path, "order_4", "dir_0", "pixel_318", "shard_0_0_0.parquet")
+    assert os.path.exists(file_name1)
+
+    file_name2 = os.path.join(tmp_path, "order_4", "dir_0", "pixel_318", "shard_0_0_1.parquet")
+    assert os.path.exists(file_name2)
+
+    merged_df = pa.parquet.read_table(os.path.join(tmp_path, "order_4", "dir_0", "pixel_318"))
+    assert len(merged_df) == 3
 
 def test_reduce_order0(parquet_shards_dir, assert_parquet_file_ids, tmp_path):
     """Test reducing into one large pixel"""
diff --git a/tests/hipscat_import/conftest.py b/tests/hipscat_import/conftest.py
index 91c1ba6b..d7cd12ef 100644
--- a/tests/hipscat_import/conftest.py
+++ b/tests/hipscat_import/conftest.py
@@ -98,6 +98,10 @@ def empty_data_dir(test_data_dir):
 def macauff_data_dir(test_data_dir):
     return os.path.join(test_data_dir, "macauff")
 
+@pytest.fixture
+def same_destination_csv(test_data_dir):
+    return os.path.join(test_data_dir, "macauff", "same_destination.csv")
+
 
 @pytest.fixture
 def formats_dir(test_data_dir):
diff --git a/tests/hipscat_import/data/macauff/same_destination.csv b/tests/hipscat_import/data/macauff/same_destination.csv
new file mode 100644
index 00000000..9d39d831
--- /dev/null
+++ b/tests/hipscat_import/data/macauff/same_destination.csv
@@ -0,0 +1,4 @@
+Gaia_designation,Gaia_RA,Gaia_Dec,CatWISE_Name,CatWISE_RA,CatWISE_Dec
+Gaia DR3 718066137586181888,131.149007,36.811269,J084435.76+364840.6,131.149020,36.811303
+Gaia DR3 717948799080732160,133.580994,37.158579,J085419.43+370931.1,133.580985,37.158652
+Gaia DR3 717948799080732160,133.580994,37.158579,J085419.43+370931.1,133.580985,37.158652
\ No newline at end of file