Databinding a check box - vb.net

Question

I have a check box that I binded with a dataset in its properties on my main form. Then on a separate form I have a datagrid that would be the options for each checkbox for a client. The datagrid is good when I look at it. but when I search for a client in the main form sometimes my checkboxes(some of them) will be selected for no reason. I have no coding for this as its all done in the properties except my search button.
Private Sub CmdSearch_Click(sender As Object, e As EventArgs) Handles CmdSearch.Click
Dim iReturn As String
Dim ClientFound As Boolean
Looking = True
ClientFound = False
Place = ClientBindingSource.Position
If Len(TxtSearch.Text) = 6 Then
ClientBindingSource.MoveFirst()
Do Until ClientFound = True
With ClientBindingSource
If Trim(TxtClient.Text) = TxtSearch.Text Then
If TxtSearch.Text = Trim(TxtClient.Text) Then
ClientFound = True
Else
ClientFound = False
End If
Place = ClientBindingSource.Position
Looking = False
Call LRSearch()
ClientBindingSource.Position = Place
Exit Sub
ElseIf Trim(TxtClient.Text) = "ZZTEST" Then
iReturn = MsgBox(TxtSearch.Text & " Not Found", vbOKOnly)
ClientBindingSource.MoveFirst()
Looking = False
Exit Sub
Else
.MoveNext()
End If
End With
Loop
Else
iReturn = MsgBox("Please check your client code for errors " & TxtSearch.Text, vbOKOnly)
TxtSearch.Text = ""
End If
Looking = False
End Sub
I am not sure why the check boxes on my main form have a mind of their own?