Password Reset does'nt work

-- url of the page with the problem -- : cobinet.eu
-- HikaShop version -- : business 2.3.3
-- Joomla version -- : 2.5.25

Hi,

when the customer has forgotten his password and wants to reset his password, he gets e-mail with url and code.
When the customer types this code in, he gets error "Your password reset confirmation failed because the verification code was invalid. User not found"
But I now exact, that the User exists and the code - I do copy that from the e-mail

Where is the problem?