We are aware that expertise racial bonuses give +1% hit to casters if they're using the required weapon, and we're even suggesting expertise enchants to casters if they're missing hit (it's tested and working 100%). We are also mentioning it in "Tips" section.
The problem is that Armory doesn't recognize it and since we're pulling data from them, it shows bad numbers. However, you are right, this can be fixed on our side and we'll try to finish it asap. Thanks for info.