How can I fix a problem associated with payment?

On my form when it goes to the payment/products section, when people pick for example, two adults, two they are only being charged the price of one. Why is this happening and how can I fix it?

I have inspected your form and this is happening because you did not enable special pricing and enter a special price for each option.

You can also select show total on the form option and then you can check if calculation of you payment filed is working correctly. 

Hope this will help. Let us know if you need further assistance. 

Also here is my demo form: https://form.jotform.com/53366200664957? 

Feel free to clone it.