Thanks for the reply friends :) I think next time it happens I will just refresh the page.

I was play using shaft gun and score very high kill-loss ratio. few minutes ago I was playing my shots were having absolutely no effect at all on the enemy. I kept playing nonetheless,later(when the game was about to end) left the game and rejoined the same game and then all was good again. I was able to kill weaker hulls with a single shot as always. why were my kills not being counted? is this a bug . Sorry for my bad English.