Problems when adding to cart

Yesterday I bought your Multicurrency plugin as I sell my services around the world.

What I needed is that on any product page, products were displayed with client’s currency (by GeoIP). For example 1 euro product it was 6 Brazilians reals. (aprox)…. but when the product was added to the cart on my Right sidebar price was multiplied once again for 6,2 so the client read 6 x 6 –> 36 brazilian reals

When client went to checkout it displayed the product well (6 brazilian reals. – You will be charged on Euros – 1 euro)

At this moment I have disabled the plugin because yesterday I lost a lot of clients, but I wanted to notice you about it, and also I would like to know how can we solve it.

Thanks