Hmm, with 6 auto coupons this shouldn’t be too noticeable. This can happen if it conflicts with another plugin that interacts with the cart. Can you please try the following?
– Temporarily enable ‘debug mode’ from our plugin’s settings page
– On the frontend add / remove a few products (reproduce the issue)
– Disable ‘debug mode’
– Download wp-admin > WooCommerce > Status > Logs > woocommerce-auto-added-coupons-xxxxxxx.log of today and send it to admin at soft79.nl