Unity POT problems

I tried asking about this on answers but got nothing. I have 1024x1024 and 512x512 pngs. When I turn the into sprites, their dimensions are forces to non POT dimensions to fit the image in the sprite to the walls. It only happens on pngs exported from illustrator. It doesn't do it on images exported from texture packer. Does anyone know why it is doing this and how I can stop it?


Thanks!