Data in report of other user rather than the one logged on

Hello:

I'm displaying some reports in the home screen for the salespeople. Reports are gathered in a dashboard and embedded in a web applet. To get data of the currently logged user, I use the NQ_SESSION.USER_ALIAS variable. The stranger thing is that, for some users (not all and not in all cases) that variable returns other user rather than the one logged on, and so displays data not belonging to the current user.

Please, see the screenshot attached. You can see in the top the name of the logged user, and in the teletype report there is the name of another user. I’ve added a table (Usuario) that simply display the value of NQ_SESSION.USER_ALIAS, checking that the user returned is wrong.