Bows have been seriously broken all season and I don't think I've seen anything in the TWAB about fixing them. It takes half a second for the damage to register, so I'm just guessing whether their shot landed or not. Wishender is definitely the main offender, but I've also seen this behavior on LeMonarque and Raconteur.
It looks like they missed, I go to re-peek, their damage from the first shot registers when I'm out of cover, and I'm screwed. Combine that with the very generous hit boxes on bows and there are situations where you see the arrow "stream" miss wide on either side and then, boom, you still take damage half a sec later. It's already hard enough to fight a good bow user without this guess-work added in.
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Especially bad on Wish Ender