Hi,
while opening the layout editor, sometimes it adds columns from the datasource to the DataGridView.
But this ouccurs not for all DataGridViews in my projects, only some and not from creating the Form. After first appear, the problem persists on the affected DataGridView.
Deleting the DataGridView and recreate it new, will help only in some cases.
I think, there will be a confusion in the desinger code, generated from the layout editor, but while trying some changes I found no approach.
Remarks:
In the generated code AutoGenerateColumns is set to false.