Receiving 2 form submissions. Can I set it up to only receive 1?

I'd like only 1 submitted form instead of 2. 

I have checked your form submissions and I can see there are not duplicated forms, upon checking your form I can see there are two email notifications that are being sent to the same email address: 

You can also set unique submissions on your form, here's a guide with more information about it: How-to-Set-Unique-Submissions-on-a-Form

Besides that, you can also set unique questions, this way you avoid to get submissions with the same info, here's also a guide about this: How-to-set-Form-Limits-Based-on-a-Unique-Question

Hope this helps.