Sorry to hear that! Well this game isn't the usual shooter, when you move your mouse the weapon starting to move in that direction. If you give a shot immediately after moving the mouse, it's possible that the bow isn't still correctly orientated at this point, but this is by game design
On the other hand, there is a bug with WebGL version for which sometimes you are able to use Keyboard & mouse controllers even if you haven't changed the settings as we suggest in the game description. In this case, mouse control is very erratic. This bug doesn't occur in the Windows version
In any case, we recommend using a gamepad since it makes the gaming experience more satisfactory