[Elecraft] Filter alignment question

[info4mjs at att.net]

Hi, 

I was monitoring the K2's local oscillator frequency and I noticed that as I tune to WWV in the various modes, that the LO frequency is different at zero beat.  I expected an offset (w/respect to SSB) in the CW mode but I expected the LO to be the same at zero beat whether I was in LSB or USB modes.  It isn't so I am wondering if something is not aligned properly.

Any insight is appreciated.

Thanks

Mike, WA1SEO
K2 4778