Shipping option npt working

I have had 2 submissions of my form that did not include the flat rate standard shipping

You are correct, it appears not to be working in your form: 

However, I cloned your form and it worked in the cloned version, URL: https://www.jotformpro.com/form/63296719328972? 

Please clone my form in your account and see if it works: https://www.jotform.com/help/42-How-to-Clone-an-Existing-Form-from-a-URL 

Let us know if you need more help, we will be glad to assist you.