Between the Trees

Let me explain how to do this quest in plain English.

(1) You goal is to stand in front of the ghost deer that are near the Sanctuary. You cannot target the deer in any way. You can't grab them or click on them and you don't use the staff for it. The staff is for the follow-up quest.

(2) If you try to fly around and land in front of the deer you will go crazy. All the deer run fixed routes. The best strategy is simply to observe where a spawn point is and camp it. This way you can't miss them. The deer spawn about once a minute. If you can't figure out a spawn point just watch the route they run and stand somewhere on it and hope no one gets it before you.

(3) You can be mounted or in druid flight form. But you must be right in front of the deer. Close to it doesn't count.

Expecto Patronum!

They spawn at several points in that area. One spawn point I found was 33,59.

I just waited there and they spawned on me. I moved a tiny bit to go "through" them and it caught them.

Not sure why you are downrating spawn coordinates. :/