I got these figures from OBD Fusion/Carista.

Short term fuel trim Bank 1 = 4.7
Long term fuel trim Bank 1 = -11.7
Short term fuel trim Bank 3 = 0.0
Long term fuel trim Bank 3 = 0.0

What's going on with Bank 1? Should I be concerned? While driving, Bank 1 does improve, but this is the default result.