if you have a 5250 session and the TCP/IP connection is broken for some reason, a new session could get started automatically producing your results. For example, in iSeries Access, one can set a property to “auto-reconnect”. When the connection is broken, a new connection is established displaying a screen for the user that is not expected. Could this be your situation?
I tend to get this from time to time (quite infrequently) when I am connected though a VPN.