diff --git a/Editor/Inspector/Parameters/DefaultValueField.cs b/Editor/Inspector/Parameters/DefaultValueField.cs
index 6ba6cd22..f29f217b 100644
--- a/Editor/Inspector/Parameters/DefaultValueField.cs
+++ b/Editor/Inspector/Parameters/DefaultValueField.cs
@@ -20,7 +20,8 @@ namespace nadena.dev.modular_avatar.core.editor
         private readonly DropdownField _boolField;
 
         private ParameterSyncType _syncType;
-
+        private bool _hasInitialBinding;
+        
         public DefaultValueField()
         {
             // Hidden binding elements
@@ -57,28 +58,39 @@ namespace nadena.dev.modular_avatar.core.editor
             {
                 _numberField.style.display = DisplayStyle.Flex;
                 _boolField.style.display = DisplayStyle.None;
-                OnUpdateNumberValue(_numberField.value);
+                OnUpdateNumberValue(_numberField.value, true);
             }
             else
             {
                 _numberField.style.display = DisplayStyle.None;
                 _boolField.style.display = DisplayStyle.Flex;
-                OnUpdateBoolValue(_boolField.value);
+                OnUpdateBoolValue(_boolField.value, true);
             }
         }
 
-        private void OnUpdateNumberValue(string value)
+        private void OnUpdateNumberValue(string value, bool implicitUpdate = false)
         {
+            // Upon initial creation, sometimes the OnUpdateSyncType fires before we receive the initial value event.
+            // In this case, suppress the update to avoid losing data.
+            if (implicitUpdate && !_hasInitialBinding) return;
+
+            var theValue = _defaultValueField.value;
             if (string.IsNullOrWhiteSpace(value))
             {
-                _defaultValueField.value = 0;
+                if (!implicitUpdate)
+                {
+                    _defaultValueField.value = 0;
+                }
+
+                theValue = _defaultValueField.value;
+
                 _hasExplicitDefaultValueField.value = false;
             }
             else if (float.TryParse(value, NumberStyles.Float, CultureInfo.InvariantCulture, out var parsed)
                 && !float.IsNaN(parsed)
                 && !float.IsInfinity(parsed))
             {
-                _defaultValueField.value = _syncType switch
+                theValue = _defaultValueField.value = _syncType switch
                 {
                     ParameterSyncType.Int => Mathf.FloorToInt(Mathf.Clamp(parsed, 0, 255)),
                     ParameterSyncType.Float => Mathf.Clamp(parsed, -1, 1),
@@ -88,11 +100,15 @@ namespace nadena.dev.modular_avatar.core.editor
                 _hasExplicitDefaultValueField.value = true;
             }
 
-            UpdateVisibleField(_defaultValueField.value, _hasExplicitDefaultValueField.value);
+            UpdateVisibleField(theValue, _hasExplicitDefaultValueField.value);
         }
 
-        private void OnUpdateBoolValue(string value)
+        private void OnUpdateBoolValue(string value, bool implicitUpdate = false)
         {
+            // Upon initial creation, sometimes the OnUpdateSyncType fires before we receive the initial value event.
+            // In this case, suppress the update to avoid losing data.
+            if (implicitUpdate && !_hasInitialBinding) return;
+            
             _defaultValueField.value = value == V_True ? 1 : 0;
             _hasExplicitDefaultValueField.value = value != V_None;
 
@@ -101,6 +117,8 @@ namespace nadena.dev.modular_avatar.core.editor
 
         private void UpdateVisibleField(float value, bool hasExplicitValue)
         {
+            _hasInitialBinding = true;
+            
             if (hasExplicitValue || Mathf.Abs(value) > 0.0000001)
             {
                 _numberField.SetValueWithoutNotify(value.ToString(CultureInfo.InvariantCulture));