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)

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. :)