Why Am I unable to heal after taking damage?

I'm having a hard time understanding whats happening. I made a medkit and a Damage Brick. The medkit works fine at healing on It's own, but when I take damage from the Brick I heal and It just regresses. I've spent almost 2 hours trying to find out whats wrong, any help?

Kill Brick(server script)

local trapPart = script.Parent

local function onPartTouch(otherPart)
    local partParent = otherPart.Parent
    local humanoid = partParent:FindFirstChildWhichIsA("Humanoid")
    if humanoid then
        humanoid:TakeDamage(10)
    end
end

trapPart.Touched:Connect(onPartTouch)

medkit(Local script)

local tool = script.Parent
local player = game.Players.LocalPlayer
repeat wait() until player.character
local character = player.character
local humanoid = character.Humanoid


function health()
    humanoid.Health = humanoid.Health + 30
    tool.Enabled = false
end

tool.Activated:Connect(health)


tool.Equipped:Connect(function()
    tool.Enabled = false
end)

Starter Player health script(Local script)

local player = game.Players.LocalPlayer
repeat wait() until player.character
character = player.character
humanoid = character.Humanoid

humanoid.Health = 10

The medkit ONLY stops working when you take damage from the brick.