So, I found my mistake on fillet factory.
I thought the corners list's length should be equal to length of points generated by "generateVertices()" method.
But, It seems it should be equal to segments count.
That's why fillet node generates that curly effect in Barry's screenshots. It tries to fillet all corner points including the "G1" corner points

I just filtered the real "G0" points out of all corner points (segments start points).

script:
var inputs = moi.geometryDatabase.getSelectedObjects().getStandaloneCurves();
var filletFacc = moi.command.createFactory('fillet');
var filletFacToGetCorners = moi.command.createFactory('fillet');
filletFacToGetCorners.setInput(0, inputs);
filletFacToGetCorners.generateVertices();
var corners = filletFacToGetCorners.getCreatedObjects();
var segments = inputs.item(0).getSubObjects();
var startPoints = [];
for(k=0; k<segments.length; k++)
{
	startPoints.push(segments.item(k).getStartPt());
}
filletFacToGetCorners.cancel();
var cornersList = moi.createList();
for ( var i = 0; i < startPoints.length; ++i ) 
{
	if(isG0Connection(startPoints[i],corners)){cornersList.add( true );}
	else{cornersList.add( false );}
}
filletFacc.setInput(0, inputs);
filletFacc.setInput(1, false);
filletFacc.setInput(2, cornersList);
filletFacc.setInput(3, 1);
filletFacc.setInput(4, 'Circular');
filletFacc.setInput(5, 1);
filletFacc.commit();
moi.log("inputs: "+inputs.length+"\n");
moi.log("Corners: "+corners.length+"\n");
moi.log("cornersList: \n");
for ( var i = 0; i < cornersList.length; ++i ) {moi.log(cornersList.item(i)+"\t")};
moi.log("\n");

function isG0Connection(point, G0Points)
{
	var isSamePoint = false;
	for(j=0; j<G0Points.length; j++)
	{
		if(point.x == G0Points.item(j).pt.x && point.y == G0Points.item(j).pt.y && point.z == G0Points.item(j).pt.z)
		{
			isSamePoint = true;
			break;
		}else{isSamePoint = false;}
	}
	return isSamePoint;
}