After moving to another page Auth User NULL

I am all day with this issue and all ready checked all similar questions and there is no solutions that i need. Please help

I am using Laravel 5.7. The problem is, when login more than one user into CRM the sessions of users are switch, for example i login as my user and when i moving to another page my user is became to user of another user that is login to or became NULL in Auth::check function.

I can rewrite it to my auth rules not build in of laravel auth, but i want understand why it is happend.

via Chebli Mohamed