By default in the Total theme the add to cart button is shown when hovering over the product entry image as opposed to the default WooCommerce display which is beneath the price and always visible. If you prefer the way WooCommerce does it by default so that it’s always visible there is an option available in the Customizer so you can easily change that.
Simply browse to Appearance > Customize > WooCommerce (Total) > Shop & Archives and enable the option that reads “Always Visible Add to Cart Button?“.
Because of how WooCommerce works some settings require you to save the Customizer option then refresh the live site. This is one of those cases.