As far as I can tell adding any amount of players/picks to the either side doesn't move the bar at all, it just stays completely to my side.
If I start with a blank trade without any players/picks the bar starts all the way to my side and like I said wont move back the other way no matter what.
If I submit the trade I believe it still works so I'm guessing it's just a graphical issue with the trade bar.
Last edited at 4/30/2016 11:28 am