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Upon checking your form, I found that you are not using any payment tool but you have added a matrix question. Unfortunately, our matrix field can only support one type of input fields. That means you cannot have check box and a text box together in matrix field.
My suggestion would be to use one of our payment integration tool. Even if you do not want to process the payment online, you can use our "Purchase Order" tool which can be found under "Payment Tools" tab.
"Purchase Order" tool will give you all the flexibility like adding quantity, displaying the total etc but will not process the payment.
These guides should help you:
Hope this helps.
Do get back to us if you have any questions.
You might like to take a look at this form that I've created also in addition to my colleague's response.
If you need further assistance, please let us know.