Script's object identification is glitched?

I'm assuming this is not the full script (like you didn't put the ends in your question). I just added the ends in there just in case.

You've accessed the humanoid as hit.Parent.Humanoid in all the lines before, and on the line in question, you have it as script.Parent.Humanoid. This is probably a syntax error and you accessed the wrong instance's parent.

Fixed Code:

script.Parent.box.Touched:connect(function(hit)
    if hit and hit.Parent and hit.Parent:FindFirstChild'Humanoid' and hit.Parent.Humanoid:FindFirstChild'bullets' then
        print(hit.Parent.Name) -- Player1
        if hit.Parent:FindFirstChild'Humanoid' then
            print(hit.Parent.Humanoid.Name) -- Humanoid
        end
        if script.Parent.Type.Value == 'Health' and hit.Parent.Humanoid.Health < hit.Parent.Humanoid.MaxHealth then
            hit.Parent.Humanoid.Health = hit.Parent.Humanoid.Health + 1.5 --You had script.Parent.Humanoid.
            script.Parent:Destroy()
        end
    end
end)

If I helped you out, be sure to accept my answer!