why is cost of pre order $43.45 and not £29.02 ??

Hi trying to pre order fm21, im a member so my price with saving is GBP £39.99 = £29.02 (27.43% discount)
but the site is showing the dollar sign $43.45 for members which means £35.43 to me when i try to buy. im very untrusting to why the difference and why i cant buy this in pounds
im from england and my profile is set up for europe, ive never had this problem before,i anyone help

I've bought from Sortitousi for the last two FM games but this is the first time I've seen it in $ too.