Stereo Imaging on Joni Mitchell's 'Blue'

Hi all,

I was wondering if anyone here has ever noticed that Joni's vocals are somewhat left of center on a few of the songs on this album? I listened to a minty German LP pressing of this album over the weekend through my speakers and with headphones. I am using a Stanton 681EEE cartridge on a Thorens turntable with Audio Research amplification. I do not have another copy of this album for which to compare. I am trying to determine whether my cartridge needs to be realigned or whether the album was recorded with the vocals slightly off-center. Besides the vocals, the stereo separation between other instruments seems great, there is no surface noise, and I do not hear any distortion in the highs. Thank you in advance for your help/suggestions.