You have a point OP
I think the arrow should be on the right side, not the left. That is, if the character is aiming tall and holding the bow straight, this way you get the ultimate balance, grip and power.
Although, if you see closely the character leans the bow a bit on the right side, thus making the arrow grip steadier and stronger while holding the arrow on the left side. There are more support points for the arrow. If he holds the arrow on the right he might struggle with grip because there's no holding point to support, he needs to push it against the bow - but this is considering we still look him holding the bow with the slight lean to the right.
I other word to fix it, they need to change the stance of shooting - either straighten the bow or change the style of holding/shooting with it. But it's not that big of a deal actually
Now i am no expert, i just use my logic that's all