Can the screen be fixed when the bottom of it is unresponsive?

I replaced a touch screen on the iPod and all seemed ok. But soon the corner started to come up. I thought I could reheat it and try to seat it back down, but after I did it the bottom of the screen will not work. The keyboard is not able to switch to numbers. When you hit the numbers tab, it causes the shift key to activate. I only heated at the top of the screen, not the bottom.