Yes, I had a similar problem when I installed my new 2.4ghz radio, it was thinking it was a 3 speed, it still does I guess if I hit the A button the wrong direction I will have to hit it twice in the correct direction it will either be in nuetral or reverse still.

I just have to remember to pull the A button toward me for reverse and let it go for forward. that just switches between forward and reverse.

If I push the A button away from me, I wind up in nuetral, then I have to pull it toward me twice, first pull is back to reverse, second pull is back in forward. WHHRRRRrrrrrrr....

Maybe you have something similar with the stock radio??