Sword bugged 1.5

So, I'm new to the development of a GunZ server, I understand the fundamentals and am fairly familiar with c++ and sql. So I will be able to understand how to fix bugs but I came across one earlier today that I didn't quite understand. I am using GunZ 1.5 and I had about 5 people in one match and for some strange reason when you would use your sword, every now and than your character would randomly try to reload the sword as if it were a shotgun, this temporarily disabled you ability to use the sword and greatly affected gameplay. I figure it's a client side bug but I'm not exactly sure how to fix it. Can anyone please assist me?