I am getting vertical black lines in my final output pdf file and can't seem to figure out where they are coming from.

Attached is an example. The line in the center is not supposed to be there.
Capture.JPG

The code I am using to write to .pdf is:
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I don't have any vertical lines in the area that is showing the lines or hidden cells. This is happening is another part of the document as well, about 2/3 of the way down.

Any suggestions?

Thanks