When i crate a dxf of a sheet metal part it creates extra geometry around the corners of the part. This extra geometry does not show up in the initial dxf view but when i reopen the file it is present. An image of the fault is below. As you can see the four inside corners a small box has appeared.
Is there a way of stopping this from happening as for work I have to create lots of dxfs everyday and correcting this is taking up a lot of my time.