My Userform keep shrinking after every use - excel

Question

Almost every time I use my user form, it shrinks, and after a few times it gets too small to see and I have to go back into the forms on my project and drag it until the size is large again. Is this a result of my code, or is there something that I can do to fix this?
Option Explicit
' called on click of "OK" button
Private Sub CommandButton1_Click()
MyFile = Me.ComboBox1.Value
Unload Me
End Sub
' called on click of "Cancel" button
Private Sub CommandButton2_Click()
Stopped = True
Unload Me
End Sub
' loads the combo box with the names of all available workbooks
Private Sub UserForm_Initialize()
Dim wkb As Workbook
With Me.ComboBox1
For Each wkb In Application.Workbooks
If wkb.Name <> ActiveWorkbook.Name Then
.AddItem wkb.Name
End If
Next wkb
End With
End Sub

Answer 1

I can't think of a reason for this to happen, especially without any code anywhere tweaking the Height and Width of the form, and with the form Unload-ing itself every time it's shown, even if you're Show-ing the form's default instance it should still be initialized with the design-time values.
You could try forcing a size explicitly in that initialize handler:
Private Sub UserForm_Initialize()
Me.Height = 480
Me.Width = 600
InitializeComponents
End Sub
Private Sub InitializeComponents()
PopulateAvailableInactiveWorkbooks
'...
End Sub
Private Sub PopulateAvailableInactiveWorkbooks()
Dim wkb As Workbook
With Me.ComboBox1
For Each wkb In Application.Workbooks
If wkb.Name <> ActiveWorkbook.Name Then
.AddItem wkb.Name
End If
Next wkb
End With
End Sub

Answer 2

If you have this issue, you may like to check;
https://www.mrexcel.com/board/threads/userforms-shrink-on-successive-openings-of-an-excel-file.1078705/
For me, adding the following to the userform code at least kept the display right.
Private Sub UserForm_Initialize()
With frm40_Overview1
Height = 600
Width = 800
End With
Application.ScreenUpdating = True
End Sub