L/R Balance. Is it right ?

Just went for a 4.5 mile ride with a Stages left only and Vector 3 attached to 2 head units

Stages [TABLE]
[TR]
Power AVG [TD]221W[/TD]
[TD]MAX 504W[/TD]
[/TR]
[/TABLE]

Vector 3
43% L / 57% R L/R Balance [TABLE]
[TR]
Power AVG [TD]214W[/TD]
[TD]MAX 458W[/TD]
[/TR]
[/TABLE]

This just doesn't make sense to me. I would expect the Stages to be less not more. How can this be verified ?