New LH skin problem

[C.Roland]

I skinned Mansa LH for Kushan's Medival mod. I changed the background picture for an interior background so i erase all the alphachannel layer on the bg dds file but it doesn't work. There's an visible line of sky at the top. Does anyone know why or what should i do to fix it ?

Thx,

ScreenShot :

N.B : That's not the finale version of this LH, there's still work to do on.