Drop Down List Code-Popping Up 3 Times

I have a drop down list full of options for my user to choose. 3 of those options I have message box codes built so that if they are selected, the message box will pop up. However, the first one in the code makes the user click the "ok" box 3 times before it goes away, the second one makes them click 2 times, and the third they just have to click once. to make it where they only need to click "OK" once on each of those?

Here is the

Private Sub Worksheet_Change(ByVal Target As Range)

Dim rngIntersect As Range
Dim rngCell As Range
Dim sMsg As String

Set rngIntersect = Intersect(Target, Range("j24:j31"))

If Not rngIntersect Is Nothing Then
For Each rngCell In rngIntersect
If CStr(rngCell.Value) = "E Checking - 105" Then
sMsg = "Please have customer complete E-Statement Application for E Checking - 105 accounts"
Exit For
End If
Next rngCell
End If