New Interaction doesn't show after 2nd: using IdentifyAs

Question

I am developing a function to support tracking user behavior through a mobile app.

Below is the current scenario:

Case 1: Anonymous User 1 - Working fine:

• Anonymous user visits the page, then these histories (interactions) are stored into xdb for anonymous user 1.

• When user logs in, Anonymous user 1 is loaded and assigned to the current session by ContactManager factory.

• After that, it will call IdentifyAs() method Identifying to know contact: userlogin

  (Sitecore.Analytics.Tracker.Current.Session.IdentifyAs("mysource", > userlogin )

• Result: For this case, it is running as per our expectation: all interactions and every new interaction of anonymous user 1 will be shown on userlogin

Case 2: Anonymous User 2/New Anonymous User - Not working fine:

• A new anonymous user visits the page, then these histories (interactions) are stored into xdb for Anonymous user 2.

• When user logs in, Anonymous user 2 is loaded and assigned to the current session by ContactManager factory.

• After that, it will call IdentifyAs() method Identifying to know contact: userlogin

  (Sitecore.Analytics.Tracker.Current.Session.IdentifyAs("mysource", userlogin )

• Result: For this case, all interactions of anonymous user 2 are shown on userlogin but new interaction for Anonymous user 2 won't be shown on userlogin

My expectation is every new interaction of anonymous user 1 will be shown on userlogin too.

Any suggestion for case 2 ? (My expectation is every new interaction of anonymous user 2 will be shown on userlogin too.)