It's the antialiasing on the border of your pumpkin
See how the black line around the pumpkin is fuzzy? Those are translucent pixels that are breaking up the border of the image. Just try filling them in with solid black, and it should solve the problem.
can I or you fix the transparent textures? or why is this happening? well, it's a very beautiful pumpkin, but it is transparent
original texture
http://i.imgur.com/2ZxrV5i.png
It's the antialiasing on the border of your pumpkin
See how the black line around the pumpkin is fuzzy? Those are translucent pixels that are breaking up the border of the image. Just try filling them in with solid black, and it should solve the problem.
they dont save in png format