Jafula added that setting "Assume All Team members Always Online" (as Lyonheart stated) some time ago, and the default setting is that it will show all your toons, online or not.
THe online ones should however still show 'online'.

I usually have the problem where slaves show offline when i first add them. Even though the channel is correct, and they appear correctly in the toon list, Jamba doesn't detect them as online.
Everything sorts itself out when i relog however, which doesn't appear to be the case for you :-/
not sure mate.