Forced to use "remember me" when logging in admin and user panel

[serjuc11111]

1.If I log in admin panel without check remember me and and click some link session is destroy somehow and logged me out.
2.The same problem for user : login in user accound then log in in admin panel click on some link(ad for eg) session is destoy, for both user and admin...
3.Login in user account and then open new tab and just go to http://domain.com/oc-admin/index.php?page=login without fill the user and password, refresh the tab where you have logged in like user and you will see that you are logged out!
No changes were made to the site,everything was perfect!
wth is going on?