weird button border problem - ie6

[KDLA]

Has anyone ever encountered this problem? (see attached)

The only CSS I have applied to these buttons is:

#grid input.button {overflow: visible; padding: .2em;}

And removing this doesn't solve the problem.

It only seems to affect the larger button, not the smaller one. I've played around with width, but that doesn't seem to affect it either.

[Fang]

The button border is an image, if it's stretched too much the corners become pixelated.

[KDLA]

So it's a browser rendering problem, and can't be controlled by my CSS?

[Fang]

No control, it's also in IE7.