To replicate the issue:

Create 2 SSO based Crowd apps using Seraph for SSO, say JIRA and Confluence.

1. Login to JIRA as Bob.
2. Click on a link in Confluence (you are now logged in as Bob)
3. Logout of Confluence (do not go to JIRA)
4. Login to Confluence as Ted
5. Go to JIRA
   • you are Bob in JIRA, you should be Ted
6. Go to Confluence
   • You are Ted, as expected