Bukkit

Hey, there's a huge bug. The bug is, Say I have a Hub right... there's a factions portal infront of me I join it and I'm straight but... When someone else joins they're invisible and don't show up in the Tab list but I can see them talking in chat to fix this you have to go back to the hub and walk through the portal again which people on my server are already annoyed with so can you please fix this bug... That is literaly the only thing wrong with this plugin it is a great plugin by the way. Thanks man hope you fix it :). Or can you tell me how to fix it?