aelia, bags of holding are cumulative. as in if you fill one, the other is still empty. the reason for having all your conatiners on one person is either soloing or being sensible and designating your highest-lore person to scavenge after battles so you can ID everything and keep it in order.
the issue that Stattaco is complaining about is a bug that was addressed in one of the patches.
the next traditional questin is "where to get the patch from", and my usual answer is "go to yahoo and look for it", but today im feeling generous and will tell you that is on
www.bioware.com .