If you have an ojs with two journals, and you register in one of them and later you log in, you already appear logged for the other journal, which is a little weird, and, to register in this journal you have to log out and click register… any info about this?
That’s intentional behavior, though it may not suit all journals (if, for example, you are acting as a hosting service provider and not a publisher). If you want the journals to appear independent but you’re using a single installation of OJS, you can use virtual hosting to provide a separate domain name for each journal. That way your session cookie will not cross domains and a separate login will be needed for each.
Public Knowledge Project Team