Calculations get messed up in the cart menu.

Im testing currency plugins for my website.

Unfortunatelly im having issues with yours, with the cart menu widget.

IT works on the Cart and checkout page. but unfortunatelly subtotal calculations are are get messed up when switching currency on all other pages. The attached screenshot shows how it calculates
DKK 128 + DKK 159 = DKK 38,56

so 38,56 would be correct if it was euros but if i switch to euros it shows
€ 17.2 + €21,37 = €287

if moving further to the checkout or cart page the calculations get correced, but this is confusing for the customer so not really usable with the menu cart widget.

Cheers thor