Hi Marcio,
Thanks for your inputs,
As you said it works fine in incognito mode.
I'm overseeing two more problems I guess this is because of using list on Navigation Header.
1. As per the below snap I have selected Tab 3, but the bottom border is still highlighting the Tab 1.

2. While adding new tabs the first two tabs are center aligned . Once I add the 3rd or more tab its aligns to left.

Regards,
Vinod