Does not work with Coupopns

I have been testing your plugin and it has great potential, but I have hit an issue when using coupons, so for now I cannot go live with it.

When buying in the local currency (base WooCommerce currency) it calculates the discount correctly. When I switch to another currency configured in the plugin, e.g. euro’s, the coupon does not work as the calculation is broken. In my coupon if you buy 3 items or more, you get 20% off your purchase price. Instead of the 20% reduction I just get the error message “The maximum spend for this coupon is €0.12.” and no reduction in cart total.