[Elecraft] K3 + softrock IF

[Peter]

Hi

I have a strange event and I like to get some feedback.
First I have in The K3 4 filters 2,7, 2,1 400 and 200 hz.and I'am using 
550hz pitch
Will using spectrogram I don't see the RX tone while moving the filter 
setting from small to wide en reverse.
So I guest I have done the offset setting correct.

When using a softrock IF, I see a jump on the output
200Hz is just fine (no shift)
400hz is 180 hz too low
2,1Kc is 200 too low
2,7Kc is 800 hz too high

I looks that the IF stage (freq) is changing while setting the filters.
Is this normal?

Peter
PC2A