Default answer for websites behaving weird: have you tried clearing the cache and deleting the cookies for interrail.eu?

Hm-I see youre Brit-and it seems that about half of Brits buying passes seem convinced they have to buy EUrail-which is not the case=that is for non-Europeans from over the oceans, meaning the continent, not the EU. IF that is so youre in big trouble and have to cancel and buy the correct pass.

Thanks that worked out for me - resetting cache - cheers!