15th anniversary mistake?

dance210: OP, what everyone means to say, is that the x2 you see in the garage is ONLY for tank experience. The x3 crew experience isn't readily visible anywhere. To check that it is working, you would need to click the Personal file for a crew member before and after a battle - you should see that he gains more experience that was stated for the tank experience (which is what you see in the After Battle report).
Hope this helps clear up your confusion :)