You alpha channel is broken I guess:
http://imgur.com/a/DSM5f
I tried to correct your image:
Download:
http://rothui.googlecode.com/svn-his...WorldPing3.tga
Sidenote. I read stuff from Iriel once about texture shearing.
http://www.vigilance-committee.org/w...m/PieShear.gif
The interesting part of that is the outer 1px offset. To see it you have to zoom in. The slice texture is 32x32 px in size but is off by 1px at the bottom. Basically only 32x31px is used. The 1px transparent row is then used to be able to shear the texture. (Basically the transparency of that one row is used as an indicator of what color to use)
Afaik the outer border of any texture that 1px is kind of special.
So if your texture is still bugging out try to keep the alpha channel black for the full 1px border of your image. (only use 30x30px inside)