Hello,
Hopefully this will address as to why the NaN errors. It is suggested that the theme author need to fix these.
Theme Check✕
woocommerce_before_single_product_summary hook is missing in the woocommerce templates of your theme. Help me fixing it.
woocommerce_single_product_summary hook is missing in the woocommerce templates of your theme. Help me fixing it.
woocommerce_before_add_to_cart_button hook is missing in the woocommerce templates of your theme. Help me fixing it.
woocommerce_after_single_product_summary hook is missing in the woocommerce templates of your theme. Help me fixing it.
woocommerce_share hook is missing in the woocommerce templates of your theme. Help me fixing it.
body_class filter was found.
If a hook or filter is missing in your theme, you can try fo fix it by yourself. This is a theme issue, because authors of themes should follow the woocommerce codex and should not remove the default woocommerce hooks in the templates files. If you can not fix it by yourself after reading the “Troubleshooting” page, please contact the theme author.
I (developer of Fancy Product Designer) will not fix these issues for you.