I had a very similar problem but encountered it in spectator. I was spectating my sister play AC as a fairly new player with an AR and I noticed the ammo numbers on her screen were off to my screen so I told her to empty the gun. It was completely empty for her but still showed up as 1/7 for me. It was on a laggy arse server so that's what I blamed. This was maybe 3 months ago.
X-Ray_Dog does have a sister >.> but she doesn't play often or at all
X-Ray_Dog does have a sister >.> but she doesn't play often or at all