diff --git a/pyqtgraph/graphicsItems/PlotItem/PlotItem.py b/pyqtgraph/graphicsItems/PlotItem/PlotItem.py
index c7d47631..d13d194c 100644
--- a/pyqtgraph/graphicsItems/PlotItem/PlotItem.py
+++ b/pyqtgraph/graphicsItems/PlotItem/PlotItem.py
@@ -238,6 +238,7 @@ class PlotItem(GraphicsWidget):
         self.ctrl.averageGroup.toggled.connect(self.avgToggled)
         
         self.ctrl.maxTracesCheck.toggled.connect(self.updateDecimation)
+        self.ctrl.forgetTracesCheck.toggled.connect(self.updateDecimation)
         self.ctrl.maxTracesSpin.valueChanged.connect(self.updateDecimation)
         
         if labels is None:
@@ -1008,12 +1009,14 @@ class PlotItem(GraphicsWidget):
         else:
             numCurves = self.ctrl.maxTracesSpin.value()
 
-        for i, curve in enumerate(self.curves):
-            if i < numCurves:
-                curve.show()
-            elif self.ctrl.forgetTracesCheck.isChecked():
+        if self.ctrl.forgetTracesCheck.isChecked():
+            for curve in self.curves[:-numCurves]:
                 curve.clear()
                 self.removeItem(curve)
+
+        for i, curve in enumerate(reversed(self.curves)):
+            if i < numCurves:
+                curve.show()
             else:
                 curve.hide()
       
diff --git a/pyqtgraph/graphicsItems/PlotItem/tests/test_PlotItem.py b/pyqtgraph/graphicsItems/PlotItem/tests/test_PlotItem.py
index 9c464ffd..0ff01a57 100644
--- a/pyqtgraph/graphicsItems/PlotItem/tests/test_PlotItem.py
+++ b/pyqtgraph/graphicsItems/PlotItem/tests/test_PlotItem.py
@@ -30,14 +30,28 @@ def test_PlotItem_maxTraces():
 
     curve1 = pg.PlotDataItem(np.random.normal(size=10))
     item.addItem(curve1)
-    assert curve1.isVisible(), f"{curve1} should be visible"
+    assert curve1.isVisible(), "curve1 should be visible"
 
     item.ctrl.maxTracesCheck.setChecked(True)
     item.ctrl.maxTracesSpin.setValue(0)
-    assert not curve1.isVisible(), f"{curve1} should not be visible"
+    assert not curve1.isVisible(), "curve1 should not be visible"
 
     item.ctrl.maxTracesCheck.setChecked(False)
-    assert curve1.isVisible(), f"{curve1} should be visible"
+    assert curve1.isVisible(), "curve1 should be visible"
+
+    curve2 = pg.PlotDataItem(np.random.normal(size=10))
+    item.addItem(curve2)
+    assert curve2.isVisible(), "curve2 should be visible"
+
+    item.ctrl.maxTracesCheck.setChecked(True)
+    item.ctrl.maxTracesSpin.setValue(1)
+    assert curve2.isVisible(), "curve2 should be visible"
+    assert not curve1.isVisible(), "curve1 should not be visible"
+    assert curve1 in item.curves, "curve1 should be in the item's curves"
+
+    item.ctrl.forgetTracesCheck.setChecked(True)
+    assert curve2 in item.curves, "curve2 should be in the item's curves"
+    assert curve1 not in item.curves, "curve1 should not be in the item's curves"
 
 
 def test_plotitem_menu_initialize():