It could be that the texture_unit above the preset_1mane.png layer doesn't have the mane fix applied to it, or it's missing the cull_hardware or cull_software codes. I'm not entirely sure. Looking at this, it seems to be something to do with whats above your texture unit.
Try this: (Just add the cull_hardware none cull_software none alpha_rejection greater_equal 128 portion above the ambient 0.5 0.5 0.5
material preset_#_maneMat
{
technique
{
pass
{
cull_hardware none
cull_software none
alpha_rejection greater_equal 128
texture_unit
{
texture preset_#mane.png
}
}
}
}