I used to go around posting this on all the asterina threads too... until I got the strain that eats SPS.
Nobody is saying all asterina eat corals. But there is at least one type that does. Just because yours don’t eat coral, doesn’t mean it’s not happening to other people.
Then it's not an Asterina. This is the problem with common names in the hobby. Just because it looks similar doesn't mean it's the same species, so it shouldn't have the same name.