Driver's Side Rear View Mirror - Double Image

[bavery118]

I just purchased a used 2010 RX 350 and noticed (once it was dark out) that there is noticable "ghosting" or double image of the headlights behind me. I didn't notice it in the passenger's side mirror and figured there was something wrong with whatever dims the mirror at night. I took it to the dealer and they asked me to leave it overnight so a service manager could drive it home that night and see what my complaint was. They said they do see what I am talking about but drove 2 other 2010's and 2 - 2012's and they are all the same! Why is it that the passenger's mirror is fine I asked? Why is it that the 2012 they loaned me doesn't have the same problem? They told me it was due to the angle or proximety that I was looking at the driver's mirror??!?! WTF?

Has anyone else had this problem?

Thanks,

At a loss