new LCD has blue tint at an angle

I just replaced my white iPhone 4 LCD-digitizer. The phone works perfectly, but the screen has a blue tint to it, especially looking at it from an angle. The old (cracked) screen looked normal before disassembly. Also, pressing on the screen makes temporary dark marks at the edges of the LCD (like when you touch a laptop LCD screen with your finger) as if it's being squished/warped from the inside, but it looks flat and flush at edges. What could I have done wrong with the installation? I have replaced many iphone 4 LCD-digitizers before, but this has never happened.