Double Coins Gamepass Wrong Values?

Hello! In my game, I am trying to make a double coins gamepass. Each round, the player should earn 5 coins (so double coins would give them 10). The gamepass works, and 10 coins are rewarded. However, if you don't own the gamepass, you sometimes receive 5 coins like you are supposed to and other times you receive 15 coins.

• No errors are given
• This has only been tested in singleplayer
• The script only happens once, because the Wins go up only 1. (This is the purpose of having some of the variables) -

Thanks to anyone who attempts to help!

script.Parent.Touched:Connect(function(p)
	local char = p.Parent.Name
	local player = game.Players:FindFirstChild(char)
	local numWins = player.leaderstats.Wins.Value
	local numCoins = player.leaderstats.Coins.Value
	local CoinsEarned = 5
	
	player.Character.HumanoidRootPart.CFrame = game.Workspace.LOBBYTELE.CFrame

	wait(2)
	local service = game:GetService("MarketplaceService")
	if service:UserOwnsGamePassAsync(player.userId,8519306) == true then
		CoinsEarned = 10
	end
	player.leaderstats.Coins.Value = numCoins + CoinsEarned
	player.leaderstats.Wins.Value = numWins + 1
end)