Receiving erron in PayPal checkout

Hi, this is the image I get when trying to checkout and I’m not sure why or what to do. 

I tested your form, but I was not able to replicate the issue. Is the issue resolved or are you still experiencing any issues with your form?

Also, I noticed you didn't have a submit button on your form. Please add one as your users/clients cannot submit the form after payment/transaction.

Hi,
It let me checkout and I added a submit button, however, once I hit submit through PayPal it took me back to the form page and then proofed to the thank you page. So how do I get rid of that to where after you go through PayPal you have to hit the submit button on the form page?
Thank you,
Erin Rodriguez
Sent from my iPhone
...

Please note that after you click on the "Paypal Checkout" button, you need to click on the submit button to submit form. 

I have moved your second question to a new thread so that we can address it separately. You will be answered in the following thread: https://www.jotform.com/answers/1961504-Is-there-anyway-to-get-rid-of-the-JotForm-advertising 

Right. What I’m saying is after I clicked on PayPal checkout, it poofed to the thank you page as if I had hit the submit button but I didn’t. 

I have tested your form but I can't seem to replicate the issue at my end.

You have enabled, Replace submit button with PayPal in your Gateway  Settings.

Once you have confirmed the payment,your form will be submitted automatically.

When I clicked on the PayPal Checkout, I was shown the PayPal login to confirm the payment.

Kindly test the form in another web browser or clear your browser's cache.