Exactly the same for me ! I had some cold sweat when I've seen this... Hotels in Copenhagen and Stockholm were 508€ and 486€ and now they are at 828€ and 927€ and I just can't pay that price (taxes=price of the room) ! The same for London, I've seen an hotel at 80€ for one night and it's now 110€. I hope it's a bug and they will correct this, otherwise I'll have to book via Expedia or booking.com and it will be expensive :)