Change cart and checkout button links on WooCommerce mini cart widget

It seems that there is a problem somewhere with your theme (or in a plugin), as the minicart button links always point to the right cart and checkout pages.

The minicart buttons are hooked in woocommerce_widget_shopping_cart_buttons action hook (in the cart/mini-cart.php WooCommerce template). You will find the details HERE on includes/wc-template-hooks.php core file. It calls 2 functions that are displaying the buttons.

First you should try to refresh WordPress Permalinks, going on WP Settings > Permalinks:
Just at the end of the page click on "save". Empty your cart, and try it again to see if it changes something.

In the code below I remove first the original buttons and I replace them by the same ones where the links are customized. For each you can change the link to feet your needs (I have added in the links ?id=1 (at the end) just for testing purpose, to check changes):

add_action( 'woocommerce_widget_shopping_cart_buttons', function(){    // Removing Buttons    remove_action( 'woocommerce_widget_shopping_cart_buttons', 'woocommerce_widget_shopping_cart_button_view_cart', 10 );    remove_action( 'woocommerce_widget_shopping_cart_buttons', 'woocommerce_widget_shopping_cart_proceed_to_checkout', 20 );    // Adding customized Buttons    add_action( 'woocommerce_widget_shopping_cart_buttons', 'custom_widget_shopping_cart_button_view_cart', 10 );    add_action( 'woocommerce_widget_shopping_cart_buttons', 'custom_widget_shopping_cart_proceed_to_checkout', 20 );}, 1 );// Custom cart buttonfunction custom_widget_shopping_cart_button_view_cart() {    $original_link = wc_get_cart_url();    $custom_link = home_url( '/cart/?id=1' ); // HERE replacing cart link    echo '<a href="' . esc_url( $custom_link ) . '" class="button wc-forward">' . esc_html__( 'View cart', 'woocommerce' ) . '</a>';}// Custom Checkout buttonfunction custom_widget_shopping_cart_proceed_to_checkout() {    $original_link = wc_get_checkout_url();    $custom_link = home_url( '/checkout/?id=1' ); // HERE replacing checkout link    echo '<a href="' . esc_url( $custom_link ) . '" class="button checkout wc-forward">' . esc_html__( 'Checkout', 'woocommerce' ) . '</a>';}

Code goes in function.php file of your active child theme (or theme) or also in any plugin file.

All code is tested on Woocommerce 3+ and works.