On assault, if you charge right after jumping you often end up going nowhere. This is the most annoying bug for me right now.. gets me killed a lot because I try to jump+charge to make a quick getaway
Sometimes it happens with the ASSassin lunge, maybe it's a bit different I don't know. It sometimes just stops in the middle.
Probably one of Uber's 'Fixes' to the bad physics. I'm guessing it's for the flying forward after charging after falling.
I think the explanation was that while you attempted to on your screen, the server decided that based on the information it had you couldn't go anywhere, and since movement is fairly much server-sided if the server thinks you aren't going anywhere, then you aren't going anywhere. Since skill and otherwise refresh/reload/charge times and animations don't apparently need to sync up whatsoever, it causes really weird issues.
I could understand that if it happened right when the charge cooldown finished But I'm just jumping and charging.. there shouldn't be any time in there that the server would decide a charge is invalid.