Dropdown menu shortcode breaks styling on checkout page

Hi,

I have implemented the shortcode [woocommerce_currency_switcher_drop_down_box] into my checkout template (within custom built theme).

But, I notice that it seems to remove over over ride styles within the checkout form fields.

If I use the other shortcodes from your plugin this does not happen, but this is not the functionality I need. I need to use the dropdown.

Can you think of any reason why this method would be removing or altering the styles for the checkout form fields? (it removes columns, margins/padding on form fields)

I am using the plugin WooCommerce Checkout Field Editor Pro to help alter the layout of these checkout fields, but the styling is still coming from my custom theme stylesheet.

Thanks!