[Elecraft] K1 filter alignment?

[Darwin, Keith]

I *think* this is a dumb question, but being blond, I'm entitled to ask
such questions in public :-)
 
While playing with the K1 last night, I noticed I could hear some of a
strong CW signal on the other side of zero beat.  This dual-receive
"feature" was noticed in wide and medium filter positions (800 Hz, 400
Hz) but the rig was back to single signal receive in the narrowest CW
filter position.  Made me wonder if something is out of alignment.  Is
there something I should look at or is this just the way the rig is?
 
I did not build this K1 so I'm learning it from the other direction.
 
- Keith -