It's the whole nomipmap deal on the 2D text, and the text texture itself is a rather higher resolution one. The reason for this is so low texture detail doesn't make the text unreadable at all.
a Nintendo 64 port of OA, I hope something can be done.
If there a way to implement some dirty blend mode subsitution engine-side rather than modifying EVERY shader file that'd be even more accurate, as in, turn everything into alpha-blend.