Pass Field Data Via Query String - sends Drop Down 'label', not 'value'

Hi

I've created a form with a dropdown/select menu. When the form is submitted I'm redirecting to a page where I can retrieve the values. I've set the Pass Field Data Via Query String, and I've also enabled and set the values and labels for the dropdown menu.

However, the form is submitting the Label of the dropdown menu, not the Value.

Am I doing something wrong?

Thank you