Error on price calculation with addons

Hi,
I’m facing an error on price calculation.

I use a plugin to insert addons fields to the product total (Advanced Product Fields for WooCommerce By StudioWombat).

When I click on add to cart the product will be added to the sidebar cart and shows the correct product price including the addons price and the sidebar cart total is correct.

But if I reload the page the sidebar cart forgets the correct product price and shows it without addons.

The strange thing is that the total sum of the mini-cart is correct showing the total price including addons.

Thanks for helping.
Angelo