iPod screen not sitting well

I just replaced a screen for a friend on their iPod 4g. it is my first iPod repair. The screen does not sit properly, it pushes it self out, and I don't know what to d0. I am using the 3M 300lse glue, is that the wrong kind? Any ideas? I can get you all the details you need, but I don't know what would be useful.

Any help is much appreciated!

Sincerely,

Micah

Thanks! I'm really staring to like iFixit a lot!