Un-Even Brake Wear At The Rear Brakes??

[awdsvx]

Last night I installed new rear rotors and new semi-metalic pads. I noticed that the old drivers rear pads are more worn than the passenger side rear. Why is that??? If anyone knows why, please let me know. Thanks in advance.

Busy day yesterday, I did 2 oil changes, one oil change for my SVX and the other for my wifes 2000 Legacy Outback, plus the brake job I did on my SVX. LOL, I still have to the rear brakes on my wife's Outback!