Comment 5 for bug 588132

> Even if it's not a bug in Inskscape, it's a bug in that svg file.

In 'share/markers/markers.svg', the difference seems intentional (though I admittedly don't know why): same path data but the empty triangle has an additional 'translate' attribute moving the triangle to align the tip with the node, e.g.:

<!-- triangles -->
 <path transform="scale(-0.8)" … d="M 5.77,0.0 L -2.88,5.0 L -2.88,-5.0 L 5.77,0.0 z "/>

<!-- Empty Triangles -->
 <path transform="scale(-0.8) translate(-6,0)" … d="M 5.77,0.0 L -2.88,5.0 L -2.88,-5.0 L 5.77,0.0 z "/>

@JazzyNico - bug or wish/request for additional markers? ;-)