[Elecraft] Filter questions

[W5UN]

I will ask here before calling Elecraft.

First, I have the following filters installed on the main rcvr, all 8 
pole: 6 Khz, 2.8kHz, 1.8 kHz, 400 Hz, 250 Hz.

There are two issues:

1. When I turn my 250 Hz filter on in config, and then select that 
filter (which is FL5 here)I can hear noise coming through but no cw 
signals come through. I can see the signals on my PowerSDR/LP-PAN 
setup and CW Skimmer. Signal comes through all the rest of the 
filters O.K. Yes, I opened the radio, and all the filters are installed.

2. I run CW Skimmer with my K3. When I change filters, the CW offset 
signal shown on CW Skimmer changes. I thought the 8 pole filters had 
no offset. Is anyone else experiencing this? Any comment appreciated.

Dave, W5UN