Logging nonexistent traffic on USB serial converter while IDLE

[malizd]

Hi All,
I have installed V0.2.2.0 64bit with filter drivers on MacBookPro running Win 10. I'm trying to sniff serial port traffic between two systems using USB serial converter.
Problem is that it captures never ending records of 256 byte forever, whilst I'm not sending any data on serial link, so expecting and empty log.
More surprising, in one log, I even so exact copy of words I'm typing here in this post !!!
Why is this happening? Is it MacBookPro mixing everything related to USB ports together?

On a desktop PC this was not happening.
Anyone can shed a light and also a possible solution?
Cheers
Matt