I don't really see a problem with the GUI for Jamba, that's the way it's supposed to look.
Since you didn't specifically ask any questions other than "What am I doing wrong"...
/em starts psychic mode
For the Items and Team boxes ALT+Drag to move them.
Jamba > Display: Team > to resize, hide and otherwise alter the appearance of the TEAM window.
Jamba > Item Use > to do likewise for the ITEM bar
ESC > Keybindings > *scroll scroll scroll scroll* Jamba-Item-Use to set keybindings for the ITEM bar. Do this on BOTH toons.
/em ends psychic mode.
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