coffeescript strange behavior in subtraction - coffeescript

Question

I must be going crazy. Coffeescript is continualy returning '0' for the difference between two non-equal integers.
x = #location[0]
y = #start[0]
console.log "#{x} - #{y} = #{x-y}"
This is outputting:
350 - 322 = 0
250 - 278 = 0
... and so on
I'm completely confused!
Edit: Here's the source in both coffee and the compiled js
class Branch
constructor: (#length, #start, #angle, #generation, #parent) ->
return if #generation >= RECURSION_LIMIT
#angleVariation = pi/3
#ratio = 2/(1+root(5))
#maxChildren = 10
#parent ?= null
#unit = 2
#children = []
#location = #start
#childLocations = [Math.random()*#length*#ratio/2+(#length*#ratio) \
for n in [0...#maxChildren]]
grow: ->
gl.beginPath()
moveTo #location
#location[0] += #unit * cos(#angle)
#location[1] -= #unit * sin(#angle)
lineTo #location
gl.stroke()
console.log #getLength()
if #getLength() >= #childLocations[#children.length]
#birthChild()
getLength: ->
x = #location[1]
y = #start[1]
console.log "#{x} - #{y} = #{x-y}"
return 1 #root( (#location[0]-#start[0])**2 + (#location[1]-#start[1])**2 )
birthChild: ->
angle = #angle + (Math.random()*#angleVariation*2) - #angleVariation
child = new Branch #length * #ratio, #location, angle, #generation+1, this
And in js:
Branch = (function() {
function Branch(length, start, angle, generation, parent) {
var n, _ref;
this.length = length;
this.start = start;
this.angle = angle;
this.generation = generation;
this.parent = parent;
if (this.generation >= RECURSION_LIMIT) {
return;
}
this.angleVariation = pi / 3;
this.ratio = 2 / (1 + root(5));
this.maxChildren = 10;
if ((_ref = this.parent) == null) {
this.parent = null;
}
this.unit = 2;
this.children = [];
this.location = this.start;
this.childLocations = [
(function() {
var _i, _ref1, _results;
_results = [];
for (n = _i = 0, _ref1 = this.maxChildren; 0 <= _ref1 ? _i < _ref1 : _i > _ref1; n = 0 <= _ref1 ? ++_i : --_i) {
_results.push(Math.random() * this.length * this.ratio / 2 + (this.length * this.ratio));
}
return _results;
}).call(this)
];
}
Branch.prototype.grow = function() {
gl.beginPath();
moveTo(this.location);
this.location[0] += this.unit * cos(this.angle);
this.location[1] -= this.unit * sin(this.angle);
lineTo(this.location);
gl.stroke();
console.log(this.getLength());
if (this.getLength() >= this.childLocations[this.children.length]) {
return this.birthChild();
}
};
Branch.prototype.getLength = function() {
var x, y;
x = this.location[1];
y = this.start[1];
console.log("" + x + " - " + y + " = " + (x - y));
return 1;
};
Branch.prototype.birthChild = function() {
var angle, child;
angle = this.angle + (Math.random() * this.angleVariation * 2) - this.angleVariation;
return child = new Branch(this.length * this.ratio, this.location, angle, this.generation + 1, this);
};
return Branch;
})();