This may be an issue where the team is set on very offensive or very defensive for almost every game played. The team confidence is actual more than one value behind the scenes, and only an aggregated value is displayed on the team page. So in some rare cases this may happen where some the team confidence for offensive duties are very good the defensive confidence value could be very low since the team are ignoring defensive duties.
However, this is something I've been wanting to rework for quite some time and hopefully I can include this within a patch or two.
Thanks for the feedback.