Ward doesnt work in bot lane bush

Lol, the ward is outside the bush. If it was in it, you'd have vision of the area, but you don't.

If you want to make sure your ward goes in the bush, you can hold the hotkey down for the indicator (if you're using quick-cast) and the indicator will be green if it's going to be in the bush, and yellow if not.

to add on to Valkyrie's comment, the ward is not in the bush because of the camera. this game is not perfectly top down. its slanted. if it next to the bush, it will seem like its in the bush from the camera's point of view.