You have Polylines that have curve segments and straight-line segments and in Model or Paper Space look correct.
When plotted using the built-in PDF plotters a jog may appear in some areas:
This is a defect that Autodesk is aware of and is logged as defect ACD-14045 with the development team.
You have a few options:
1. You can accept the gap in the PDF’s
2. You can try other PDF plotters (Adobe, Bluebeam, etc.) until you find one that does work properly
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