Why is the shipping so cheap on my site?

No more how many items you add to cart, the shiping on my site stays the same. It didnt use to do this. Im not sure if this is normal now. I dont want to open my site to the public and have people check out with shipping for me to take a loss. Can someone please try adding items to cart on my site and see how much shipping is for you and if this is normal?

nevermind i figured it out

You can set multiple shipping rates based on weight to solve this from store admin > Settings > Shipping and Delivery.