DS Touch Screen Calibration Problem

I have the original NDS, and I recently put on a touch screen protector since I noticed that the touch screen was getting a bit scratched....so I bought a touch screen protector for the top and bottom screen and I correctly applied both of them on my DS. The problem is, I think I'm experiencing some touch screen sensitivity problems after applying the protector...like when I play touch screen operated games such as warioware, elite beat agents, or trauma center...the screen seems to not
be responsive...I tried calibrating the screen, but the test repeated itself for like an hour, and it never said "calibration complete" or sumthing like that. The stylus I use is from Nintendo, whereas the touch screen protector is from Pelican products....can anyone help