[Elecraft] KX3 - broadcast band interference ??

[yo8sep]

A few days ago I've noticed something strange at my KX3.
If was around dusk and I was on 20m band, USB trying to listen for a very
low signal station and got something that looks like an AM brodcasting , but
not in a language that I can understand.
The strange thing was that was heard even when tuning to different
frequencies.
PRE was on, antenna was yagi 3 elements on 20m, at 12m height.

I've made a short video, sorry for the poor quality. 
https://www.youtube.com/watch?v=CX7fr6Iwg-Q
<https://www.youtube.com/watch?v=CX7fr6Iwg-Q>  
 
If I changed the RX SHIFT settings to 8KHz, I still could see that signal on
panadapter (NAP3) but audio was shifted to 8kHz.

What could cause that problem/interference ? 

73,
Petronel
YO8SEP




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