When I'm using [fpd] shortcode is is showing two designers, or at least two main bars. This is a problem, please can you advise, or let me know if you need any further information.
Currently you can only use one designer in a single page.
I am having this same issue, see my page https://www.sweetsandthings.shop/product/test/ - I am using the default UI - it displays properly in the composer, but is messed up on the frontend...
You do not need to place a shortcode in woocommerce products. In WooCommerce its working without shortcodes. Just select product(s) in the meta box and it will appear, in the settings you can control the placement of the designer in WC products.