It's the dashed line horizontally along the center of the weld symbol. I don't recall this line being there before updating to SW 2019, but now I can't find a set of symbols without it.
Try changing the standard from iso to ansi or vice versa.
I had been trying to change it in the weld symbol properties, as in the note on the drawing. To get the line to disappear, you have to change the standard in the Document Properties.
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