Hello,
Mini cart displays price inc. vat for the product even when we enabled Storefront http://prntscr.com/mojmtv Also, it displays the double price if we add 2 products to cart http://prntscr.com/mojyc2
Problem is caused by WooCommerce Tax Toggle. Contact plugin author to fix the issue because when plugin is disabled with Storefront and our theme everything is ok https://gyazo.com/7ec1cafcfc2e8d1220b1967ba7edf4b0
Regards