diff --git a/gui/builtinItemStatsViews/attributeSlider.py b/gui/builtinItemStatsViews/attributeSlider.py
index 964f1458b..46e7abcc3 100644
--- a/gui/builtinItemStatsViews/attributeSlider.py
+++ b/gui/builtinItemStatsViews/attributeSlider.py
@@ -10,12 +10,13 @@ _ValueChanged, EVT_VALUE_CHANGED = wx.lib.newevent.NewEvent()
 
 
 class AttributeSliderChangeEvent:
-    def __init__(self, obj, old_value, new_value, old_percentage, new_percentage):
+    def __init__(self, obj, old_value, new_value, old_percentage, new_percentage, affect_modified_flag=True):
         self.__obj = obj
         self.__old = old_value
         self.__new = new_value
         self.__old_percent = old_percentage
         self.__new_percent = new_percentage
+        self.__affect_modified_flag = affect_modified_flag
 
     def GetObj(self):
         return self.__obj
@@ -32,6 +33,10 @@ class AttributeSliderChangeEvent:
     def GetPercentage(self):
         return self.__new_percent
 
+    @property
+    def AffectsModifiedFlag(self):
+        return self.__affect_modified_flag
+
     Object = property(GetObj)
     OldValue = property(GetOldValue)
     Value = property(GetValue)
@@ -40,9 +45,9 @@ class AttributeSliderChangeEvent:
 
 
 class ValueChanged(_ValueChanged, AttributeSliderChangeEvent):
-    def __init__(self, obj, old_value, new_value, old_percentage, new_percentage):
+    def __init__(self, obj, old_value, new_value, old_percentage, new_percentage, affect_modified_flag=True):
         _ValueChanged.__init__(self)
-        AttributeSliderChangeEvent.__init__(self, obj, old_value, new_value, old_percentage, new_percentage)
+        AttributeSliderChangeEvent.__init__(self, obj, old_value, new_value, old_percentage, new_percentage, affect_modified_flag=affect_modified_flag)
 
 
 class AttributeSlider(wx.Panel):
@@ -118,7 +123,7 @@ class AttributeSlider(wx.Panel):
         self.SetValue(self.GetValue())
         evt.Skip()
 
-    def SetValue(self, value, post_event=True):
+    def SetValue(self, value, post_event=True, affect_modified_flag=True):
         self.ctrl.SetValue(value)
         invert_factor = -1 if self.inverse else 1
         if value >= self.base_value:
@@ -127,7 +132,7 @@ class AttributeSlider(wx.Panel):
             slider_percentage = (value - self.base_value) / (self.base_value - self.UserMinValue) * 100 * invert_factor
         self.slider.SetValue(slider_percentage)
         if post_event:
-            wx.PostEvent(self, ValueChanged(self, None, value, None, slider_percentage))
+            wx.PostEvent(self, ValueChanged(self, None, value, None, slider_percentage, affect_modified_flag=affect_modified_flag))
 
     def OnMouseWheel(self, evt):
         if evt.GetWheelRotation() > 0 and evt.GetWheelAxis() == wx.MOUSE_WHEEL_VERTICAL:
diff --git a/gui/builtinItemStatsViews/itemMutator.py b/gui/builtinItemStatsViews/itemMutator.py
index f70b8bf43..59d1ad171 100644
--- a/gui/builtinItemStatsViews/itemMutator.py
+++ b/gui/builtinItemStatsViews/itemMutator.py
@@ -172,7 +172,8 @@ class ItemMutatorList(wx.ScrolledWindow):
         self.SetSizer(sizer)
 
     def changeMutatedValue(self, evt):
-        self.isModified = True
+        if evt.AffectsModifiedFlag:
+            self.isModified = True
         m = self.event_mapping[evt.Object]
         value = evt.Value
         value = m.attribute.unit.ComplicateValue(value)
@@ -195,7 +196,7 @@ class ItemMutatorList(wx.ScrolledWindow):
         for slider, m in self.event_mapping.items():
             value = sFit.changeMutatedValuePrelim(m, m.baseValue)
             value = m.attribute.unit.SimplifyValue(value)
-            slider.SetValue(value)
+            slider.SetValue(value, affect_modified_flag=False)
         evt.Skip()
 
     def randomMutatedValues(self, evt):
@@ -205,7 +206,7 @@ class ItemMutatorList(wx.ScrolledWindow):
             value = random.uniform(m.minValue, m.maxValue)
             value = sFit.changeMutatedValuePrelim(m, value)
             value = m.attribute.unit.SimplifyValue(value)
-            slider.SetValue(value)
+            slider.SetValue(value, affect_modified_flag=False)
         evt.Skip()
 
     def revertChanges(self, evt):
@@ -215,23 +216,26 @@ class ItemMutatorList(wx.ScrolledWindow):
             if m.attrID in self.initialMutations:
                 value = sFit.changeMutatedValuePrelim(m, self.initialMutations[m.attrID])
                 value = m.attribute.unit.SimplifyValue(value)
-                slider.SetValue(value)
+                slider.SetValue(value, affect_modified_flag=False)
         evt.Skip()
 
     def OnWindowClose(self):
         # Submit mutation changes
         sFit = Fit.getInstance()
         fit = sFit.getFit(self.carryingFitID)
-        if self.isModified and self.mod in fit.modules:
-            currentMutation = {}
-            for slider, m in self.event_mapping.items():
-                # Sliders may have more up-to-date info than mutator in case we changed
-                # value in slider and without confirming it, decided to close window
-                value = slider.GetValue()
-                value = m.attribute.unit.ComplicateValue(value)
-                if value != m.value:
-                    value = sFit.changeMutatedValuePrelim(m, value)
-                currentMutation[m.attrID] = value
+        if self.mod in fit.modules:
+            if self.isModified:
+                currentMutation = {}
+                for slider, m in self.event_mapping.items():
+                    # Sliders may have more up-to-date info than mutator in case we changed
+                    # value in slider and without confirming it, decided to close window
+                    value = slider.GetValue()
+                    value = m.attribute.unit.ComplicateValue(value)
+                    if value != m.value:
+                        value = sFit.changeMutatedValuePrelim(m, value)
+                    currentMutation[m.attrID] = value
+            else:
+                currentMutation = self.initialMutations
             mainFrame = gui.mainFrame.MainFrame.getInstance()
             mainFrame.getCommandForFit(self.carryingFitID).Submit(cmd.GuiChangeLocalModuleMutationCommand(
                 fitID=self.carryingFitID,