Error with currency converter on product page

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Hello all,

Would love some input on my problem of the product page showing the correct numerical value for the price of the item, but showing the incorrect currency.

To summarise. The product for example will show as £20.00 if accessed from the UK, but then once you move from the collection page onto the product page, it goes to $20.00.

I am using a theme that I bought but I am unable to get support from the author. 

Does anybody know of any easy code to fix this problem?

Website is

Thanks in advance.