Form not populating properly

Hi. I added some custom fields to the woocommerce checkout form and need certain fields to lay next to one another. Even though in the setup they are below one another with the position set as left and the next one right, they are not next to one another on the front end.

Site is https://s-leer.co.za/. You can create a user at the “Registeer” tab in the action bar at the top or go to https://s-leer.co.za/registreer/ and then navigate to https://s-leer.co.za/my-profiel/ to check out the form under billing address.

https://www.ads-software.com/plugins/woocommerce-checkout-manager/