Logged in UserName is all the time referring to only one username , though different people are logg

Hi All,

When we are logging in to Oracle Ebs R12 instance by using a specific username and password , lets say A user has logged in and he has 5 responsibilities and when the A logs out and when the B user is logging in , the suprise that we are seeing is that , though B has logged in and if the User B has 4 responsibilities then what is happening is that we are able to see 4 responsibilities but the logged in name still shows as A user.
Hence whoever is logging in , the responsibilities are showing correctly but the logged in User is all the time showing as A only.