These are not bugs per se.
There is no use in calling the Crepuscular Princes miracle multiple times, because its effects wouldn't stack and he cannot move after a call; therefore it would only be a poor decision on the player's side.
But we don't really need to allow the players to do such mistakes, so we will prevent it by limiting it to a 1 call / activation with the next patch.
As for Occult Erosion, it's not a bug, it's a feature
More seriously, we do not believe that a Priest could call it more than 3 times in a row during a single turn.
We will still take your feedback into account and limit it to 3 calls / activation.
But yes, we do want the Priest to be able to call it multiple times, while the Paladin can only call it once (though as a Warrior-Monk, he benefits from others advantages with this miracle that you listed in another thread, if I remember correctly).