Mystical addition to total price after currency conversion

Situation:
GBP to EUR rate = 1.14

Product price 833 GBP, extras 100 GBP = total 933 GBP.
Total price shown on Cart – 933 GBP.

After the currency changed to EUR:
Product price 949.62 Eur + Extras price 114 Eur = Total 1063.62 Eur
Total price shown on cart – 1196.57 Eur (instead of 1063.62 Eur. Where did 132.95 Eur came from??)

Pictures attached. Same situation with other currencies. Cart value is shown without error only on default currency, if the currency is changed, mystical value is added to total amount.