Tax display error on currency switching

Hi!

Just getting to know HikeShop Starter.
Switching the currency on the checkout results in wrong tax displaying, see the attached files, please.The tax value doesn't change.
The test environment:
Joomla 2.5.1
HikeShop Starter 1.5.6
settings:
default currency HUF (rate 1), two other currencies EUR,USD with other rates;
default tax 'ÁFA' with 27%
store location: Hungary

What can I do?