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.