Keeps converting price to Euros

Hello, so i have the Ready! Ecommerce shopping cart plugin. Everything’s working great, but whenever i add perimeters to a product, like a size chart, when you click on one of the options, the price that’s in GBP converts itself to Euros. It still has the ￡ symbol, except its gone up in price.

When going to the checkout, the price goes back to GBP though.

Any ideas?

Thanks