Price increases for in cart & checkout | Please Help

Hi

I am new to woo com and i am having trouble setting up different currencies.

The plug in seems to work fine and show correct currencies however when you add products to cart, the price increases and i cannot figure out why. Please can somebody help me out as I do not want my customers to get confused at the checkout.

I currently have my settings set so you have to checkout in GBP (default) so customers can still checkout but I have attached my settings and screenshots of the error.

Many thanks
Jack