I just played on siege and on most of the maps everything was as usual, but suddenly on one map with rain, fog and nighttime (dont know if thats related somehow) some of my blows were kind oflaggy...like I would hold back the strike for some time but in fact I released the mousebutton a second or two ago.
Also attack/block directions are some times fucked up and I'm pretty sure to know how to do that right.
My Ping was quite okay that time (~40) and mostly I don't experience this kind of problem, but its annoying nonetheless.