Variable is 1 extra than it should be

hey guys, ive attached an FLA.

basically i want it so that when u click my upMC it pluses speed by 1 point, but if the person clicks the downMC to take a point off and the points = 0 then it wont subtract anything. and if the person tries to plus a point but the points have ran out, then it wont plus.

Its hard to understand i know, ive done it though, but one problem is that for sum reason i cant figure out the points are always being added by 1 whenever the user gets to 10 and then clicks back down again. u have to see it to understand it.

thanx aot guys.