Thank you for the answers!!
Yes you are correct, I'm using VMWorkstation to run those test, but I have a phisical machine with two realteck cards in it and the issue is still the same, I looked a lot in google but it doesn't seem like someone else is having the same issue.
Also you were right when I unplug the cable everything is working fine (Thanks for that), but I still don't understand if this is the way it should work.
If you ask me if I put the master card down the other should take its load
Thanks for those answers guys