Users swapping PHP server and session vars randomly

Hi I'm experiencing a strange situation. The users are getting other user's $_SESSION and $_SERVER vars randomly. Example: If I print $_SERVER['REMOTE_ADDR'> I receive different ips (randomly): [Removed - Please attach images directly to the thread] After some time [Removed - Please attach images directly to the thread] After some time 56973 The same occurs with $_SESSION var. Some idea how fix this? ----- Server information: cPanel Version: 76.0 (build 20) Apache Version: 2.4.38 PHP Version: 5.6.40 (PHP site version 7.2) MySQL Version: 5.7.25 Architecture: x86_64 Operating System: linux (CentOS) Perl Version: 5.16.3 Kernel Version: 4.9.120-xxxx-std-ipv6-64