1) You have disabled breadcrumbs in Theme Options > General > Breadcrumbs.
If you want to show product title on your page if you don’t show breadcrumbs go to Theme Options > E-Commerce > Single Product > Show page title above the price > On.
2) All the info about tax you can find in WooCommerce documentation https://docs.woocommerce.com/document/setting-up-taxes-in-woocommerce/
We’ll be able to help you only in case problem appears with our theme only and works fine with official WC theme Storefront. So, go to Appearance > Themes > install and activate Storefront and check if your price is calculated in right way. If not – read WC documentation, if yes – reply back.