Retopoflow jumping polygons

Has anyone had this problem, where you’re clicking in retopoflow to set a polygon, and as your making your second click, your first vert jumps in the direction of your cursor?
Pausing for a moment between clicking seems to avoid the issue, but that’s not ideal, slows me down, and it’s a new behavior not present on my previous project.
Any thoughts on the cause or how to fix?