Session Management Using OAuth2.0 for multiple tabs

Question

We are facing a scenario, whenever we login to our company internal portal, it generates one access-token and one refresh-token, but the page automatically expires before the timeout.

Steps:

1. Login to the portal
2. Duplicate the tab (2-3 tabs)
3. Do some activity in the duplicated tabs
4. Session expires randomly across every tabs

We found that, the the refresh token from tab-1 is calling different access-token from tab-2 and so on.

I'm testing the application, so not sure if the refresh-token can call the same access-token across the tabs?

Please advise.