edit user profile does not work

Hi, if a customer logs into his account details/profile and wants to edit his or her profile this doesn't work.
See:
schrijfklasje.nl/Edit-user-details.html
go to tab `Je account`
username Student
password STUDENT
Any idea why this is happening?
thank you, Damiaan

hi,
I have sh404SEF and saw that the nof sef link is
index.php?option=com_users&Itemid=339&lang=nl&layout=edit&view=profile
I tried to change the SEF url back to non sef but that caused flooding problems,
Should I disable SH404SEF for Hikashop or would that bring me into trouble with custom pages I made (e.g. I have two accesspoints for my products: a menu and a module - this gives two different URL's and thus when customers `like` the product it is only counted on one of those pages - I corrected this with SH404SEF and would hate to see that solution gone!)
thank you, Damiaan

hi, thanks for the suggestion.

I turned it off and changed the SEF URL Edit-user-details.html to
index.php?option=com_users&Itemid=339&lang=nl&layout=edit&view=profile in the SH404SEf URL manager.

But now the error: too many redirects appears. This seems obvious because the NON SEF redirects to the same URL, I presume causing loops. What would be the correct way to handle this?