User forgotten password mail not sent

Hi all,
We have an issue now, I dont know if it is related to hikashop or just a joomla failure:
On the login form, when user hits the "forgotten password" the system does not sends out the desired email, but redirects to the
hikashop extended user registration form ( redirect user registration to hikashop plugin...) Only when SEF URLs are on, with mod_rewrite.
When SEF URLs are off, everything works fine, user gets the mail. Any Ideas?
Thanks.

Update:
When "Redirect Joomla registration to HikaShop Plugin" turned off, the user password reset works properly: email sent out to user. If the plugin enabled, after the user enters email the page redirected to Hikashop registration page and no email sent out.

Any suggestions? We need to do something quickly, because the site is live now.

Thanks.

Hi Nicolas,

When User hits "I have forgotten my password" on login form, redirected here:
(SEF and mod_rewrite both ON, hika redirect plugin ON):

../regisztráció?view=reset ..here enters email address, then submits, and redirected here:
../component/hikashop/user/form?Itemid=484 ..which is not good, here should be password reset code confirmation form.

When user hits "I have forgotten my password" on login form, redirected here:
(SEF and mod_rewrite both OFF, hika redirect plugin on):

../index.php?option=com_users&view=reset ..here enters email address, then submits, and redirected here:
../index.php?option=com_users&view=reset&layout=confirm which is the right URL. In this case, email sent out correctly.

I have also attached the actual .htaccess file as txt if it does matters.

Joomla version is the latest: 2.5.9 hikashop version 2.0

Does anyone has an idea on this problem?