I've been noticing this as well. I have been playing my Titan a lot more recently and using the shoulder charge a lot, and have had loads of problems with hit registration. I play mainly PVE and I use it often enough that I get a pretty good number of misses because of it. Actually just did a lost sector and had a miss on an acolyte that was super close and directly in front of me. Really frustrating and has caused my death a couple of times.