Duplicates aren't deleting?

I have an idea this is a dumb question…
I wish to run the black lines once, they are running three times.
I have run the “Delete Duplicates” it doesn’t appear to be getting all of them. Perhaps easiest way to clear it up is redo the entire drawing.

The black line looks pretty thick. Zoom in and make sure there are not 3 lines.

There were several additional lines that didn’t delete. Have them removed now, program working.
Thank you

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