diff --git a/ctapipe/reco/sklearn.py b/ctapipe/reco/sklearn.py
index 976ecb6079e..1ae0bc78158 100644
--- a/ctapipe/reco/sklearn.py
+++ b/ctapipe/reco/sklearn.py
@@ -416,7 +416,7 @@ def predict_table(self, key, table: Table) -> Dict[ReconstructionProperty, Table
             result,
             ReconstructedEnergyContainer,
             prefix=self.prefix,
-            stereo=False,
+            add_tel_prefix=True,
         )
         return {ReconstructionProperty.ENERGY: result}
 
@@ -480,7 +480,10 @@ def predict_table(self, key, table: Table) -> Dict[ReconstructionProperty, Table
             }
         )
         add_defaults_and_meta(
-            result, ParticleClassificationContainer, prefix=self.prefix, stereo=False
+            result,
+            ParticleClassificationContainer,
+            prefix=self.prefix,
+            add_tel_prefix=True,
         )
         return {ReconstructionProperty.PARTICLE_TYPE: result}
 
@@ -770,7 +773,8 @@ def predict_table(self, key, table: Table) -> Dict[ReconstructionProperty, Table
             disp_result,
             DispContainer,
             prefix=f"{self.prefix}_parameter",
-            stereo=False,
+            # disp is always per telescope, so no need to add the prefix
+            add_tel_prefix=False,
         )
 
         psi = table["hillas_psi"].quantity.to_value(u.rad)
@@ -797,7 +801,7 @@ def predict_table(self, key, table: Table) -> Dict[ReconstructionProperty, Table
             altaz_result,
             ReconstructedGeometryContainer,
             prefix=self.prefix,
-            stereo=False,
+            add_tel_prefix=True,
         )
 
         return {
diff --git a/ctapipe/reco/utils.py b/ctapipe/reco/utils.py
index bf26d948074..66824292cea 100644
--- a/ctapipe/reco/utils.py
+++ b/ctapipe/reco/utils.py
@@ -1,4 +1,4 @@
-def add_defaults_and_meta(table, container, prefix=None, stereo=True):
+def add_defaults_and_meta(table, container, prefix=None, add_tel_prefix=False):
     """
     Fill column descriptions and default values into table for container
 
@@ -10,7 +10,7 @@ def add_defaults_and_meta(table, container, prefix=None, stereo=True):
         the container class to add columns and descriptions to the table
     prefix : str
         prefix for the column names
-    stereo : bool
+    add_tel_prefix : bool
         If False, add a ``tel_`` prefix to the column names to signal it's
         telescope-wise quantity
     """
@@ -18,13 +18,13 @@ def add_defaults_and_meta(table, container, prefix=None, stereo=True):
         prefix = container.default_prefix
 
     for name, field in container.fields.items():
-        if not stereo and name == "telescopes":
+        if add_tel_prefix and name == "telescopes":
             continue
 
-        if stereo:
-            colname = f"{prefix}_{name}"
-        else:
+        if add_tel_prefix:
             colname = f"{prefix}_tel_{name}"
+        else:
+            colname = f"{prefix}_{name}"
 
         if colname not in table.colnames and field.default is not None:
             table[colname] = field.default
diff --git a/ctapipe/tools/tests/test_apply_models.py b/ctapipe/tools/tests/test_apply_models.py
index 13f8edb805a..32b0e4bcc86 100644
--- a/ctapipe/tools/tests/test_apply_models.py
+++ b/ctapipe/tools/tests/test_apply_models.py
@@ -103,7 +103,6 @@ def test_apply_all(
     energy_regressor_path,
     particle_classifier_path,
     disp_reconstructor_path,
-    dl2_shower_geometry_file_lapalma,
     tmp_path,
 ):
     from ctapipe.tools.apply_models import ApplyModels
@@ -211,6 +210,7 @@ def test_apply_all(
         assert f"{prefix_disp}_tel_is_valid" in tel_events.colnames
         assert f"{prefix_disp}_parameter_norm" in tel_events.colnames
         assert f"{prefix_disp}_parameter_is_valid" in tel_events.colnames
+        assert f"{prefix_disp}_parameter_tel_is_valid" not in tel_events.colnames
 
         # check that the "--no-dl1-parameters" option worked
         assert "hillas_intensity" not in tel_events.colnames
diff --git a/docs/changes/2440.bugfix.rst b/docs/changes/2440.bugfix.rst
new file mode 100644
index 00000000000..435d4288113
--- /dev/null
+++ b/docs/changes/2440.bugfix.rst
@@ -0,0 +1 @@
+Fix additional, unwanted columns being written into disp prediction output.