How to fix elseif statement not running?

I've made an if statement with an elseif statement in a while wait() loop. But only the if statement run because whenever the if statement returns false but the elseif statement returns true it doesn't run the function in the scope of the elseif statement. Here's the code. Also the function is called whenever the player presses E while near the object I set it to.

function RequestGemConvert()
    local Coins = 0
    local MaximumCoins = game.ReplicatedStorage.ConvertGems:InvokeServer(0,false) -- so we would only invoke it once

    script.Parent.GemConverter.Open.Value = true

    script.Parent.GemConverter.Background:TweenPosition(UDim2.new(0.5,0,0.5,0),"Out","Quint",0.5,true)

    script.Parent.GemConverter.Background.Add.MouseButton1Click:Connect(function()
        Coins = Coins + 1           
    end)

    script.Parent.GemConverter.Background.Subtract.MouseButton1Click:Connect(function()
        Coins = Coins - 1
    end)

    script.Parent.GemConverter.Background.Max.MouseButton1Click:Connect(function()
        Coins = MaximumCoins
    end)

    script.Parent.GemConverter.Background.Min.MouseButton1Click:Connect(function()
        Coins = 0
    end)

    script.Parent.GemConverter.Background.Convert.MouseButton1Click:Connect(function()
        if game.Players.LocalPlayer:WaitForChild("Leaderstats").Coins.Value == 0 or Coins < 5 then
            module:SendNotification("Error!","You only gave the machine a little amount of Coins! You need to spend 5 Coins or more in this machine to get any amount of Gems!")
        else
            game.ReplicatedStorage.ConvertGems:InvokeServer(Coins,true)
            script.Parent.GemConverter.Background:TweenPosition(UDim2.new(0.5,0,1.5,0),"In","Quint",0.5,true)
            module:SendNotification("Awesome!","Successfully converted your coins to Gems!")
            script.Parent.GemConverter.Open.Value = false
        end
    end)

    script.Parent.GemConverter.Background.Exit.MouseButton1Click:Connect(function()
        script.Parent.GemConverter.Background:TweenPosition(UDim2.new(0.5,0,1.5,0),"In","Quint",0.5,true)
        script.Parent.GemConverter.Open.Value = false
        Coins = 0
    end)


    while wait() do
        script.Parent.GemConverter.Background.Coins.TextLabel.Text = module:RequestPlaceValue(Coins)
        script.Parent.GemConverter.Background.Gems.TextLabel.Text = module:RequestPlaceValue(math.floor(Coins / 5))

        if Coins == 0 then -- Working if statement
            script.Parent.GemConverter.Background.Subtract.Visible = false
            script.Parent.GemConverter.Background.Add.Visible = true
        elseif Coins == game.Players.LocalPlayer:WaitForChild("Leaderstats").Coins.Value then -- not working elseif statement
            script.Parent.GemConverter.Background.Add.Visible = false
            script.Parent.GemConverter.Background.Subtract.Visible = true
        else
            script.Parent.GemConverter.Background.Add.Visible = true
            script.Parent.GemConverter.Background.Subtract.Visible = true
            script.Parent.GemConverter.Background.Max.Visible = true
            script.Parent.GemConverter.Background.Min.Visible = true            
        end

        if script.Parent.GemConverter.Open.Value == false then
            break
        end
    end
end