Infinito3010:
then before I take the next shot, I click on the meter bar and the player takes a swing.
Aha, I've had this problem as well. Almost as if my avatar has developed a twitch. I have a wireless mouse with a huge appetite for batteries and normally, changing the batteries cures it for a time. Also if you have a click wheel this can cause it . A good blast of air shifts any fluff or whatever collected around it.
Maybe try another mouse, a wired mouse or something. Pretty sure it's not a game issue.
Cheers
Rich