Snapping Issues

I'm using Power InRoads V8i SS3 Verson 08.11.09.493

 

I've been having an intermittent issues with snapping to points when placing horizontal geometry.

Whether I tentative click first or not, the start point of my line ends up placing offset from the point I have snapped to (see attached images)

 

Is there a particular reason for this?

 

Thanks, Evan