Mark 8:9-13
The Coming of Elijah
And as they were coming down the mountain, he charged them to tell no one what they had seen, until the Son of man should have risen from the dead. So they kept the matter to themselves, questioning what the rising from the dead meant. And they asked him, "Why do the scribes say that first Eli’jah must come? And he said to them, "Eli’jah does come first to restore all things; and how is it written of the Son of man, that he should suffer many things and be treated with contempt? But I tell you that Eli’jah has come, and they did to him whatever they pleased, as it is written of him."
I don’t meant to start an argument but, it is mentioned in more then one Gospel That John the baptism is Eli’jah. It is true that John deny this but Jesus confirm it later to his disciple. It is written in more then one Gospels.
Anyway, the Catholic church does follow the teaching of Jesus and perhaps a priest could explain this phenomena with John and Eli’jah. And if this is called reincarnation or something else.
Blessing and love