Twice convert currency on product detail page with attributes

[j6954]

Hi,

I have problem with convert currency on product detail page with attributes (on product list page, specials, cart... it's convert ok).

Example:
default currency is CZK - 414CZK
convert to EUR (x0.043) - 17.81EUR (on product list page, product detail without attributes, cart... OK)
on product detail page but is calculated 0.77EUR - twice convert CZK to EUR - WHY???

Thanks so much for your help!
JP.