Can't change the default User Group on HS reg

-- HikaShop version -- : 2.3.5
-- Joomla version -- : 3.3.6
-- PHP version -- : 5.4.16
-- Error-message(debug-mod must be tuned on) -- :

I can't change the default (Registered) User Group, on HS registration, no matter what is set in User Manager->New User Registration Group

In the same time on HM and Joomla that works fine!

HikaShop has its own "User group on registration" option in the configuration of HikaShop. If you changed it to something else than "inherit" then it doesn't use the Joomla option anymore.