Ah, clearly you've never run into Malcolm Smith, who used to post here
a lot. His favorite topic was the so-called "magic form", whose major
drawback you've just seen.

The problem is that the userform that you design in VBA is really a
"class", or a template for making multiple forms that all have the
same behavior. It's unfortunate that VBA also allows you to invoke an
instance of the class itself just by calling its .Show method. When
you do that from several different macros, though, they all get a
reference to the _same_ instance.

In each of your macros, construct a local object whose type is the
userform class. Each object will refer to a _different_ instance, and
will return its values to the macro that owns it. Here's the sort of
code you need:

Sub macro1()
  Dim localString As String
  Dim UF1 As UserForm1
  Set UF1 = New UserForm1
  With UF1
     ' optionally, set any starting variables in the userform
     .GlobalVar1 = "starting value"

     .Show  ' runs the specific instance UF1 until it hides

     ' retrieve results and send to document
     localString = .TextBox1.Text
     If Len(Trim(localString)) > 0 Then
        ActiveDocument.Bookmarks("bk1").Range.Text _
           = localString
     End If
  End With

  Set UF1 = Nothing  ' free its memory
End Sub

In the userform itself, instead of calling the Unload method to end
the userform, call Me.Hide, which returns control to the calling macro
but doesn't remove it from memory (that's why you set the userform
object to Nothing at the end of the macro).

--
Regards,
Jay Freedman
Microsoft Word MVP        FAQ: http://word.mvps.org
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