I'm not sure about what you are describing. The front rotors on my car have an area where the internal vents exit near the center of the rotor toward the outside of the car. The rears do the same except that the vent path is toward the inside of the car. That's how vented rotors are made. The need to finish venting somewhere.
By the way, smear a little anti-sieze compound between the hubs and the rotors and you won't have as hard of a time removing the rotors next time. Do it now before it is too late.
