diff --git a/func/Module_precisely_align.py b/func/Module_precisely_align.py
index cab4006..481355b 100644
--- a/func/Module_precisely_align.py
+++ b/func/Module_precisely_align.py
@@ -494,18 +494,25 @@ class MainWindow_precisely_align(QMainWindow):
             self.ax0.set_title("JJIV")
             self.ax1.set_title("RRIV")
 
-            def on_xlim_changed(ax):
-                if ax is self.ax0:
-                    x0, x1 = ax.get_xlim()
-                    self.ax1.callbacks.disconnect('xlim_changed')
-                    self.ax1.set_xlim(x0, x1)
-                    self.ax1.callbacks.connect('xlim_changed', on_xlim_changed)
-                elif ax is self.ax1:
-                    x0, x1 = ax.get_xlim()
-                    self.ax0.callbacks.disconnect('xlim_changed')
-                    self.ax0.set_xlim(x0, x1)
-                    self.ax0.callbacks.connect('xlim_changed', on_xlim_changed)
+            self._syncing_xlim_change = False
 
+            def on_ax0_xlim_changed(ax):
+                if self._syncing_xlim_change:
+                    return
+                if ax is self.ax0:
+                    self._syncing_xlim_change = True
+                    x0, x1 = ax.get_xlim()
+                    self.ax1.set_xlim(x0, x1)
+                    self._syncing_xlim_change = False
+
+            def on_ax1_xlim_changed(ax):
+                if self._syncing_xlim_change:
+                    return
+                if ax is self.ax1:
+                    self._syncing_xlim_change = True
+                    x0, x1 = ax.get_xlim()
+                    self.ax0.set_xlim(x0, x1)
+                    self._syncing_xlim_change = False
 
             if self.data.BCG_early:
                 Jpeak = Jpeak - self.data.approximately_align_pos
@@ -556,8 +563,8 @@ class MainWindow_precisely_align(QMainWindow):
                           label=Constants.PRECISELY_ALIGN_PLOT_LABEL_RRIV)
             self.ax1.xaxis.set_major_formatter(Params.FORMATTER)
 
-            self.ax0.callbacks.connect('xlim_changed', on_xlim_changed)
-            self.ax1.callbacks.connect('xlim_changed', on_xlim_changed)
+            self.ax0.callbacks.connect('xlim_changed', on_ax0_xlim_changed)
+            self.ax1.callbacks.connect('xlim_changed', on_ax1_xlim_changed)
 
 
             self.ax0.legend(loc=Constants.PLOT_UPPER_RIGHT)