My Grass's Randomly Out Of Sync? [SOLVED]

Lemme explain. lol

I'm trying to code grass to make it look more realistic (in Roblox), but for some reason the grass doesn't sync up with the different size changes. I'm trying to get it so that the grass doesn't stay the same size, but instead changes it up. (1x1x1>1x2x1>2x2x1>.65x1.4x.9>etc)

<Boi y u tryna code grass>

B/c I'm bored.

<Any errors?>

Nope, no errors. I'm not quite sure what I'm doing wrong either.

This's the grass script:

local grass = script.Parent:WaitForChild('Mesh')
local num1, num2 = 1, 1

while true do
    for i = num2, num1 do
        grass.Scale = Vector3.new(.6+(.4/50*i),.6+(.4/50*i),1.9+(.4/50*i))
        wait(1/20)
    end
    num1 = num2
    num2 = Random.new():NextInteger(1, 60)
    if num1 > num2 then
        num2 = num1-num2
    end
    if num2 > num1 then
        num2 = num2-num1
    end
    for i = num1, num2, -1 do
        grass.Scale = Vector3.new(.6+(.4/50*i),.6+(.4/50*i),1.9+(.4/50*i))
        wait(1/20)
    end
end

If you have any questions, please let me know. :)

<EDIT> I just rewrote the script. :P