I'm not on my toes, that I can tell, my heel does come up though, like in pedaling. I do notice that as soon as I stop, even if I am still on the ellipitical, the tingling stops. I am on the ball of my foot alot of the time. Its just a real weird sensation.
When I started excersing they told me this might happen on the elliptical. Are you on your toes while doing the elliptical. You probably are and don't know it. Try to do straighen out your foot when the toes start to tingle. I do and it stops for me. Good luck