Multiseries graph using d3.v2.js - d3.js

Question

We are plotting a multilinear graph using d3.v2.js .
We are using ordinal scale for x-axis and linear scale for y-axis as we have labels(string) to be shown in x-axis
and numbers to be shown in y-axis.
In some cases graph appears to be fine , but in some cases it plots x-axis and y-axis independently and y-axis values are not in sync with x-axis values.
Also plotting starts from 0 instead of first x-axis value.
Any pointers to this issue would be of great help.
Thanks in advance.
Please find the code below.
function plotMOAGraph(data , sigPathways){
var margin = {top: 20, right: 80, bottom: 30, left: 100},
width = 960 - margin.left - margin.right,
height = 400 - margin.top - margin.bottom;
var x = d3.scale.ordinal(
(d3.range(0,sigPathways.length))).rangeBands([0, width]);
var y = d3.scale.linear()
.range([height, 0]);
var color = d3.scale.category10();
var xAxis = d3.svg.axis()
.scale(x)
.orient("bottom");
var yAxis = d3.svg.axis()
.scale(y)
.orient("left");
var line = d3.svg.line()
.interpolate("basis")
.x(function(d) { return x(d.pathway); })
.y(function(d) { return y(d.score); });
var svg = d3.select("#graphDiv").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", 450 + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
color.domain(d3.keys(data[0]).filter(function(key) { return key !== "pathway"; }));
var entityNames = color.domain().map(function(name) {
return {
name: name,
values: data.map(function(d) {
return {pathway: d.pathway, score: +d[name]};
})
};
});
x.domain(sigPathways);
y.domain([
d3.min(entityNames, function(c) { return d3.min(c.values, function(v) { return v.score; }); }),
d3.max(entityNames, function(c) { return d3.max(c.values, function(v) { return v.score; }); })
]);
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis)
.append("text")
.attr("dy", "9em")
.attr("dx","40em")
.style("text-anchor", "end")
.text("Pathways");
svg.append("g")
.attr("class", "y axis")
.call(yAxis)
.append("text")
.attr("transform", "rotate(-90)")
.attr("y", 6)
.attr("dy", "-4em")
.style("text-anchor", "end")
.text("Pathway Scores");
var tooltip = d3.select("#graphDiv")
.append("div")
.style("visibility", "hidden")
;
var rotateXAxis = function(d) {
var name = d.substr(0, 15);
if(name !== d) {
name = name + " ... ";
}
var el = d3.select(this);
el.text('').attr("transform", "rotate(-45)").attr("text-anchor", "end").on("mouseover", showTooltip).on("mouseout",hideTooltip);
var tspan = el.append('tspan').text(name);
tspan.attr('x', 0).attr('dy', '0');
};
svg.selectAll('g.x.axis g text').each(rotateXAxis);
function showTooltip(d) {
tooltip.text(d).style("position","absolute")
.style("top", (d3.event.pageY)-10+"px")
.style("left", (d3.event.pageX)-300+"px")
.style("visibility", "visible")
.style("font-size", "12px");
}
function hideTooltip() {
tooltip.style("visibility", "hidden");
}
var entityName = svg.selectAll(".entityName")
.data(entityNames)
.enter().append("g")
.attr("class", "entityName");
entityName.append("path")
.attr("class", "line")
.attr("d", function(d) {
return line(d.values); })
.style("stroke", function(d) {return color(d.name); });
entityName.append("text")
.datum(function(d) { return {name: d.name, value: d.values[d.values.length - 1]}; })
.attr("transform", function(d) { return "translate(" + x(d.value.pathway) + "," + y(d.value.score) + ")"; })
.attr("x", 3)
.attr("dy", ".35em")
.text(function(d) { return d.name; });
}