Hello,
It’s not related to theme update in any way. You just added the price code as the tax suffix in the WooCommerce > Settings > Tax. Remove the suffix or add it in correct way with title, for example “Price incl. VAT: {price_including_tax}” Read more here https://docs.woocommerce.com/document/setting-up-taxes-in-woocommerce/#price-display-suffix
Regards
