Old session is not terminating when logged-in with multiple partner

environment: LB
Login: Partner
Partner credentials: partnerhspl123
Password@1
browser:Chrome and Mozilla firefox

Steps:
1.Open browser chrome.
2.Login as partner on LB
3.Open browser Mozilla firefox
4.Login as partner on LB.
5.Old session terminated popup open.click on Ok.
6.Open first browser(Chrome) and perform any action.

Actual result: Action done on first browser work properly.
Expected result: Old session should be terminated.
Refer attached screen shot

Note-It's working properly on stage

CC: Rakesh Roy Hrishikesh Deshpande Prasad Pise Jayshree Nagpure