score:3

Accepted answer

This is because the points are so close together their hit raidus is over lapping.

if you add the following property as an option to the graph you should find that all points will be reachable, of course once the graph gets too small even setting this as 1 will not help

  pointHitDetectionRadius:1

http://jsbin.com/xiconuraqu/1/edit?html,js,output


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