The DataBroker text shows the number of different targets that have been affected by your Fiery Claws, and the estimated ratio (positive or negative) of expected vs. actual damage.
The DataBroker tooltip shows detailed information about the targe...
By default the addon will not show any messages in chat frame during combat, only the small combat summary which is shown at the bottom.
By enabling the 'Debug' option, it will provide detailed information about what's happening.