The game looks OK to me, and looks like you do only have 1 boat left that is unsunk.

First 3 moves of the game, you got to take 5 shots each turn because you had 5 boats that were unsunk.
Turn 4 you had 4 shots because you only had 4 boats left unsunk
Turn 5 you had 3 shots because you only had 3 boats left unsunk
Turn 6 you had 2 shots because you only had 2 boats left unsunk.

Now turn 7, you only have 1 boat left unsunk, so you only get 1 shot.