I agree with everyone on this thread that it's ridiculous that a company would charge you for the repair and then send you back something that looks like this.
I've seen this before on repaired Evo screens (the big "blob" under the screen after the repair). For those that want to do their own repair, you should be aware of this issue. The problem is that when you take the screen off, it usually removes the adhesive on the sides of the screen. If you don't replace that, the screen sits too close to the LCD, touches it, and creates that ugly spot. In addition, you'll end up getting a lot of dust under the screen.
In short, make sure to replace the adhesive on the left and right side if you want to prevent this from happening. If you're hiring someone to do it, make sure they replace the side adhesive.