WC Kalkulator total doesn’t update the price correctly

Hi

First of all let me just say that your plugin is very good.

I just have one problem.

I have a store that sell fabrics/cloths by meter.

I am using the woocommerce quantity field to allow customers to buy for example 1,5 meters (with a plugin that only does that)

The problem is that in the product page, the WC Kalkulator total doesn’t update the price correctly. For example, if each meter costs € 5,00 and if the customer selects 1,5 meters, the total shown is € 5,00 and it should be € 7,50

However if the customer add the product to the cart, the cart page shows the correct amount that is € 7,50

Can you please tell how I can correct this?

Best regards