Why is this countdown timer only working in test mode?

I'm making a game where you have a certain amount of time to destroy a wall. This script is basically acting as a countdown timer. I'm using another script inside a gui to get the time information so the player can see. Its supposed to loop and start back at 10:00 after is restarts. (I have another script that makes the wall regenerate when the value of "Clock" is "Restarting...") This all works perfectly in test mode but when I actually play the game it just keeps restarting. Someone help plz lol

TimeInSeconds = 600
TimeInMinutes = math.floor(TimeInSeconds/60)
remainder = TimeInSeconds % 60
clockText = script.Parent.Clock

while wait() do
for i = 1, remainder do
	wait(1)
	if TimeInMinutes > 9 then
		if remainder - i < 10 then
			clockText.Value = TimeInMinutes..":0"..remainder-i..""
		else
			clockText.Value = TimeInMinutes..":"..remainder-i..""
		end
	else
		if remainder - i < 10 then
			clockText.Value = "0"..TimeInMinutes..":0"..remainder-i..""
		else
			clockText.Value = "0"..TimeInMinutes..":"..remainder-i..""
		end
	end
end


for i = 1, TimeInMinutes do
	TimeInMinutes = TimeInMinutes - 1
	for i = 1, 60 do
		wait(1)
		if TimeInMinutes > 9 then
			if 60 - i < 10 then
				clockText.Value = TimeInMinutes..":".."0"..(60-i)..""
			else
				clockText.Value = TimeInMinutes..":"..(60-i)..""
			end
		else
			if 60 - i < 10 then
				clockText.Value = "0"..TimeInMinutes..":0"..(60-i)..""
			else
				clockText.Value = "0"..TimeInMinutes..":"..(60-i)..""
			end
		end
	end
end
clockText.Value = "Restarting..."
wait(2)
end