GTalk Contacts Disappearing

[King Julian]

The contacts in my chat list seem to disappear every time I sign out. Then if I need to see them again,I've to add them to my list again and they should accept it. Doesn't end over there, the contacts disappear again if I sign out. This happens only with selected contacts. The others are permanent over there. This problem started coming up after my account was hacked a year ago and I got it back but this is what happens after that, contacts disappear. Please Help.

Thanks