When I choose to "mail a check" paypal still comes up

https://www.jotform.com/showbizzathesands/KickoffattheSandsEntryForm

here is the link, when I choose the option to mail a check the paypal lilnk still comes up

You should show the PayPal payment field only when "I Wish to Pay Now By Credit Card" option is selected.

Smart Forms Using Conditional Logic

Here is a demo form - https://form.jotform.com/82344726045961 

Feel free to test it and clone it. 

I would also suggest you to check the following guide:

How to Set up PayPal Along with Other Payment Options