d="m 209.57067,821.56629 c 0,0 -14.05776,36.08917 -29.21747,46.19654 -22.72914,15.15412 -80.782534,13.80346 -80.782534,13.80346"
means a zero-length Bezier handle at each end of the line. That's sort of bogus, but is what you get by default in some draw programs, including Inkscape. The SVG spec is ambiguous about this. The renderers which get it wrong seem to get it right for the line end, but wrong for the the line start. Thanks.