Select Value In Dropdown Using Param in URL

Heya! I've got a website that I'm working on and I'm trying to use the "get_parameter" shortcode to select an option in a select box in my form based on the URL my users are coming from.

For example, in the select box on the backend I've entered "[get param=name]" into the Dynamic default value field. The dropdown is a list of names. Then when I build my URLs, I have "websitename.com/form-page?name=John%20Doe" as a link title. Instead of taking me to that form page with "John Doe" selected in the dropdown, it redirects me to the page "websitename.com/John-Doe" regardless of whether or not that page exists.

I've gone through the documentation and some of the help desk questions and I FEEL like I'm doing it right but I must be missing some critical piece of info. Any suggestions would be tremendously helpful. Thank you!