Odd middle split in my pane?

Hello all, I hope this is the right place for my questions... I'm working 
on a POC that contains what I need to do and I'm having trouble with my 
pane being split in half.

I definitely need to be able to save a complex layout of AuiNotebook items 
so that my users can restore their views later on, so if this code isn't 
going to work for that I'd like to know that too.

If you look at "PanelOneNest" and "PanelTwoNest" in "PanelOne" you can see 
that they are divided in half. I'm not sure what I did to cause this! 
Please help, thank you!

import wx
import wx.lib.agw.aui as aui 

class TabPanelOne(wx.Panel):
def __init__(self, parent):
wx.Panel.__init__(self, parent=parent, id=wx.ID_ANY)

sizer = wx.BoxSizer(wx.VERTICAL)
txtOne = wx.TextCtrl(self, wx.ID_ANY, "")
txtTwo = wx.TextCtrl(self, wx.ID_ANY, "")

sizer = wx.BoxSizer(wx.VERTICAL)
sizer.Add(txtOne, 0, wx.ALL, 5)
sizer.Add(txtTwo, 0, wx.ALL, 5)

self.SetSizer(sizer)

class PanelCaseDetails(wx.Panel):
def __init__(self, parent, _mgr):
wx.Panel.__init__(self, parent=parent, id=wx.ID_ANY)

sizer = wx.BoxSizer(wx.VERTICAL)

notebook = aui.AuiNotebook(self)
panelOneNest = TabPanelOne(notebook)
panelTwoNest = TabPanelOne(notebook)
notebook.AddPage(panelOneNest, "PanelOneNest", False)
notebook.AddPage(panelTwoNest, "PanelTwoNest", False)
_mgr.AddPane(notebook, 
aui.AuiPaneInfo().Name("notebook_content_child").
CenterPane().PaneBorder(False)) 

self.SetSizer(sizer)

class MainFrame(wx.Frame):
def __init__(self):
wx.Frame.__init__(self, None, wx.ID_ANY, 
"AGW AUI Notebook Tutorial",
size=(600,400))
self._mgr = aui.AuiManager()
self._mgr.SetManagedWindow(self)
notebook = aui.AuiNotebook(self)
panelOne = PanelCaseDetails(notebook, self._mgr)
panelTwo = TabPanelOne(notebook)
notebook.AddPage(panelOne, "PanelOne", False)
notebook.AddPage(panelTwo, "PanelTwo", False)
self._mgr.AddPane(notebook, 
aui.AuiPaneInfo().Name("notebook_content").
CenterPane().PaneBorder(True)) 

self._mgr.Update()
print(self._mgr.SavePerspective())
#notebook.EnableTab(0, False) #this doesn't go here but may be useful later
if __name__ == "__main__":
app = wx.PySimpleApp()
frame = MainFrame()
frame.Show()
app.MainLoop()

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