Woocommerce date promotion price is not valid in different currencies

Hello.

We are using premium version of WooCommerce Multi Currency and we have the settings arranged so that the prices are not chnaging automatically whit exchange rate but that we insert fixed price for each product and currency.
Primary currency EUR, additional GBP and USD.

When we now select a date campaign in the Woocokmerca product and set the date campaign prices, the campaigns are reflected incorrectly in foreign currencies.

Example:
Product price in ERU: €100, promotional price €80, sale -20%
inset GBP price: £150, sale price £120, sale -20%
In the front-end of this product actually says:
€100, promotional price €80 correctly, and when changing currency to GBH it is:
£80, promotion £64, i.e. based on the promotional price of the product in the primary currency.

Where cen be the problem?
How can we test and fixe this?