It makes duplicate lines. So if you export a dxf of a square it should have 4 lines. It sometimes creates lines over one another so you may have multiple copies of the same line in exactly the same place. So you could have 5 or 6 or more lines.
I'm so used to using the AI export that it doesn't matter. Remember, I export to AI format and then import AI format from CorelDraw instead of using DXF.
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