Why is it that the graph of 2 equal functions differ as shown in the picture?

Question

I was graphing

$$y=\frac{x^{\frac{1}{3}}-4^{\frac13}}{x^2-8x+16}$$

and

$$y=\frac{x^{\frac{1}{3}}-4^{\frac13}}{(x-4)^2}$$

but they seemed to differ at $x=4$ as shown in the picture. Why is that?