Battle.net User ID Changed

I have been playing Diablo Immortal since release and my Battle.net User ID has always been Adaitanley#XXXX which is my main characters name. I recently created an alternate character on a different server named Draston and my Battle.net User ID changed itself to that characters name (Draston#11353). I am wanting to keep my original User ID of Adaitanley#XXXX and will be attempting to create another new character named that on another server to see if it fixes the issue.