Cart BUG when remove product in cart

Good morning,
I found a bug inside the WooPrice Calculator plugin.

I have already tried with different versions of WooCommerce and with different themes (even the default one) but the problem has not been solved.

I added to the cart a simple product (without the WooPrice Calculator plugin) and a product with the WooPrice Calculator plugin. Once in the cart, if I delete the product with the WooPrice Calculator plugin, the whole section "cart-collaterals" that contains the total order and especially the button "Complete order" disappears. This prevents the customer from placing an order.

Here a video that explain and show the BUG:

Please, can anyone help me to solve the issue?
Thank you