diff --git a/agent/component/fillup.py b/agent/component/fillup.py
index 7c354610d7..c335731662 100644
--- a/agent/component/fillup.py
+++ b/agent/component/fillup.py
@@ -114,6 +114,13 @@ class UserFillUp(ComponentBase):
             self.set_output("tips", content)
         layout_recognize = self._param.layout_recognize or None
         merged_inputs = self._merge_runtime_inputs(kwargs.get("inputs", {}))
+        if not merged_inputs:
+            # No fresh user answer was supplied on this entry. Clear any values
+            # retained from a previous response so the canvas wait-check treats
+            # the form as unsatisfied and pauses for input again. Without this,
+            # an Await Response node inside a Loop would only pause on the first
+            # iteration and silently reuse the earlier answer afterwards.
+            self._clear_form_values()
         for k, v in merged_inputs.items():
             if self.check_if_canceled("UserFillUp processing"):
                 return
@@ -121,5 +128,18 @@ class UserFillUp(ComponentBase):
             self.set_output(k, resolved)
             self.set_input_value(k, resolved)
 
+    def _clear_form_values(self):
+        for field in self.get_input_elements().values():
+            if not isinstance(field, dict):
+                continue
+            field_type = str(field.get("type", "")).lower()
+            # An optional file input is already treated as satisfied when empty
+            # (see Canvas._is_input_field_satisfied), so clearing it would not
+            # force a re-prompt and would only drop a previously uploaded file.
+            # Leave it untouched to avoid unexpected data loss.
+            if "file" in field_type and field.get("optional"):
+                continue
+            field["value"] = None
+
     def thoughts(self) -> str:
         return "Waiting for your input..."
diff --git a/test/testcases/test_web_api/test_canvas_app/test_fillup_unit.py b/test/testcases/test_web_api/test_canvas_app/test_fillup_unit.py
index 1bec402f38..9b812d9fcd 100644
--- a/test/testcases/test_web_api/test_canvas_app/test_fillup_unit.py
+++ b/test/testcases/test_web_api/test_canvas_app/test_fillup_unit.py
@@ -153,3 +153,58 @@ def test_user_fillup_does_not_consume_unmatched_structured_query(monkeypatch):
 
     assert component._param.outputs == {}
     assert component._canvas.globals["sys.__initial_user_input_consumed__"] is False
+
+
+@pytest.mark.p2
+def test_user_fillup_clears_stale_values_on_reentry_without_answer(monkeypatch):
+    # A fresh entry with no user answer (e.g. a new Loop iteration) must clear
+    # any value retained from a previous response so the form is treated as
+    # unsatisfied and the workflow pauses for input again.
+    module = _load_fillup_module(monkeypatch)
+    component = _make_fillup(
+        module,
+        query="",
+        inputs={"demo": {"type": "options", "name": "Demo", "value": "previous answer"}},
+    )
+
+    component._invoke(inputs={})
+
+    assert component._param.inputs["demo"]["value"] is None
+
+
+@pytest.mark.p2
+def test_user_fillup_keeps_values_when_answer_supplied(monkeypatch):
+    # When the user actually answers, the supplied value must be applied and
+    # not cleared.
+    module = _load_fillup_module(monkeypatch)
+    component = _make_fillup(
+        module,
+        query="",
+        inputs={"demo": {"type": "options", "name": "Demo", "value": "previous answer"}},
+    )
+
+    component._invoke(inputs={"demo": {"value": "new answer"}})
+
+    assert component._param.inputs["demo"]["value"] == "new answer"
+    assert component._param.outputs["demo"]["value"] == "new answer"
+
+
+@pytest.mark.p2
+def test_user_fillup_reentry_keeps_optional_file_value(monkeypatch):
+    # An optional file input is already treated as satisfied when empty, so
+    # clearing it would not force a re-prompt and would only drop a previously
+    # uploaded file. It must be preserved on re-entry.
+    module = _load_fillup_module(monkeypatch)
+    component = _make_fillup(
+        module,
+        query="",
+        inputs={
+            "text": {"type": "line", "name": "Text", "value": "previous answer"},
+            "doc": {"type": "file", "name": "Doc", "optional": True, "value": ["file-id"]},
+        },
+    )
+
+    component._invoke(inputs={})
+
+    assert component._param.inputs["text"]["value"] is None
+    assert component._param.inputs["doc"]["value"] == ["file-id"]